Like I said in the title, if anybody can figure this out I'll be eternally grateful. All my life I've loved to sing but I've always had problems with my voice. I have no idea what it is or even how to describe it properly. I guess you could say I'm a baritone, and I've got a pretty good falsetto, but I can't hit anything above a F (above middle C) in full voice. I can't scream or yell at all, and I lose my voice really easily, even from just normal usage.

When I was younger, around 12 or so, it was even worse. I've had two surgeries since then, one for a deviated septum and one to have my adenoids out. Both of these helped immensely but when I compare my voice with others it's still incredibly weak. I've been to all sorts of ENT's and they look in my throat and say, "yeah, your vocal cords are really red," but none of them have ever been able to really figure it out. I drink tons of water, I don't smoke, I don't drink alcohol, coffee, tea, or take in any caffeine or stimulants.

I've been to speech pathologists, taken inhaler steroids, taken medicine for acid-reflux, taken medication for allergies, and done just about anything else you could think of, but to no avail. I'm almost 25 now, and I've just about resigned myself to the fact that it's just genetics and there's nothing I can do. If anybody reads this and has any ideas I would really, really appreciate it. Thanks.

Oh my goodness. I don't know anything about what's wrong so I guess I'm not of any help but I really hope you find your answer soon. I hope all goes well for you!

Maybe indeed it is because of genetics. But why do you worry about those high notes if you have great baritone voice. My voice in high register is also bad, I am deep bass and can normally reach middle E or F with full voice, but my falsetto is a total crap, besides that it does not resound and it's murmurous, it is only about 4 tones and after that I also can't get anything, so my highest note is somewhere an octave above middle c, it depends on a day. My friends have a beautiful falsetto and they can scream very high notes like girls. As I understood that screaming isn't falsetto, it is something like a second breakpoint but I don't have such kind of thing, I have only very weak and short ranged falsetto and nothing more. I have a friend, who has the same voice, so I think some people just have such voice and there is nothing to do.

Yeah, I do like my falsetto voice, and I wouldn't mind just being able to sing with the range I have now. It's just the lack endurance and longevity that kills me. 4 or 5 songs and I'm done for a week. If I'm at a baseball game or a concert and I scream at all I'm out of commission for almost a month. I'm not straining either, it's all supported from my diaphragm. What bothers me even more is that once in a great while, for seemingly no reason at all, my voice will just get better. I'll be able to sing higher, clearer, my passagio's are smoother, then it will just go away. So I know I have the potential, I just don't know how to get there. But I've got nothing against being a baritone.

That's normal you get tired after singing in higher register, but for a week, I usually need only few minutes to recur, but that's only then, when I follow the rules, so when I feel myself tired, I just stop and rest a bit, but that's one situation. I have also experienced performances, where there is no other way than screaming the high notes due to weariness, but my voices is back if not the same day then next morning certainly. But such things happen only when I'm singing in choir, solo singing is always well organized and intended. Maybe your songs are too high for you to sing them all for once and 4-5 songs is way too much I think, my repertoire usually consists of 2 songs, first in higer reg, second in middle reg. Anyways, when you are having performance, do you also sing days before?

Not usually, like I said, I take it pretty easy making sure I use proper technique when I warm up and when I'm singing. The recovery period is a big red flag in my mind that something is wrong. What about a humidifier mask? Do you think that would help any? I do live in a dry climate...

I'd recommend singing days before, but carefully, without hurting yourself, then you will achieve much better quality, including longer endurance, improved tone and wider range, for the performance. In my location, dry climate is an extraneous problem. We have rather contrary problem, may get too cold and wet... Although I have experienced the consequences of hot sun in summer, it really dries my voice and while singing, I just have to drink water every 5 minutes. Plus smoking , drinking alcohol, eating, doing sports, yelling and talking too much(of course you didn't mention those things:D but I just brought an example), then there should be no thinking of proper singing and shipshape voice. It is adviced to drink body temperature water as you know ... but in a dry environment, it's going to take them a lot I think ...

What about vocal fold augmentation? Does anybody know anything about that?

"vocal fold augmentation"- what's that, you mean like uplifting the break point?

Not exactly, you should go here and check it out:

http://www.ucdvoice.org/caha.html

As you can tell, there's almost nothing I won't do to get this figured out...

I had this same problem, especially when I was younger. I am a very light lyric baritone. My voice has improved by using vocal execises from Seth Riggs' book "Singing For The Stars" and using his Singer's Advantage program. I still would never sing as high as F above middle C in chest voice ( this is not proper technique for a baritone plus it could damage your voice) With the exercises I have learned to sing smoothly into my higher range and can sing comfortably as high as C an octave above middle C or higher( I sing The Darkness' "I Believe in a Thing Called Love" at karoaoke and hit the high A, but it's a bit of a strain.) You, like myself will probably never sound like a tenor though. In my higher range I sound more like an alto or countertenor, my voice starts to sound lighter as low as A below middle C. As for vocal strength this will come slowly with exercise(like a body builder! hahaha!) just be patient and do the exercises.
Good luck!