I'm 21, no previous injuries on this finger (or any finger since like 6 years ago), just started climbing again 2 months ago after not climbing for a while. Mostly bouldering.

First presented with mild pain between thumb side and palm side of left index finger, mostly just when pressure applied. Continued to climb on it (apparently a horrible idea...) for ~1.5 weeks, about 4-5 times in the gym. Only really hurt while climbing the last time I climbed, which was on Friday(2 days ago).

Finger was fine yesterday, maybe some mild swelling, but that might have been imagination, no real pain. Took 2 ibuprofen between 4pm and 8pm, went to bed around 2am.

Woke up some time in the middle of the night and when I extended my index finger it caught when the knuckle closest to my palm was at about 90 degrees, then opened fully. Then I felt extremely nauseated, light headed and started having cold sweats (I often feel nausea rather than severe pain, but it was pretty fucking awful).

Anyway, now I can't bend my index finger even to 90 degrees anymore without feeling sick, and it aches when I extend the finger to straight. I'm planning to go see the sports medicine clinic at UGA ASAP, where hopefully they can refer me to someone if necessary.

Any help with diagnosis/treatment is appeciated! Currently I am just resting the finger and keeping it mildly elevated.

That sounds like the most intense finger injury ever. I have some awful ones, and they have never made me nauseous or break out in sweats. Good luck.
If you have insurance, I wouldn't go to the UGA clinic.

Well, I think part of it is that my body just reacts that way to pain. I rarely feel intense pain, I just feel very sick to my stomach.

I have insurance, but since I go to UGA I figured I could just go there first. Is that just going to be a waste of my time?

I'm 21

Mostly bouldering.

Continued to climb on it

Only really hurt while climbing the last time I climbed

Finger was fine yesterday

Woke up some time in the middle of the night and jerked off.

Anyway, now I can't bend my index finger

Any help with diagnosis/treatment is appeciated! Currently I am just resting the finger and keeping it mildly elevated.

just be patient as the best internet doctors on the planet will soon respond because they always check this site for injured people seeking medical advice for free.

Finger was fine yesterday, maybe some mild swelling, but that might have been imagination, no real pain. Took 2 ibuprofen between 4pm and 8pm, went to bed around 2am.

If it was "fine", why did you take ibuprofen?

When you say, "no real pain", what does that mean? Does it mean "no pain", or does it mean, "it didn't make me want to puke"?

People have all different reactions to pain. Some get nausea, some have panic attacks, some withdraw, some attack, some even respond rationally. So let's just call it "pain", and not dwell on your wanting to puke. It really doesn't matter that much.

If I was in your shoes, I'd ask to get a referral to a certified hand therapist, preferably one with experience treating athletes.

Failing that, my clinical instinct would be to do lots of range of motion on it, as long as that doesn't make it worse. NO STRETCHING. Move on to progressive resistance exercise as soon as you can, again, as long as you can do so without making it worse.

(If you don't know the difference between "stretching", and "range of motion exercise", then you need to do some due diligence of your own.)