I figure I should make a fact post to cover all the things I went over in chat the other day and elaborate some more.
What I definitely have
I've always had radioulnar synostosis, which means my radius and ulna are fused. This means I can't rotate my wrists from palm down to palm up. This has never really caused any pain or problems for me before besides it being awkward accepting change.
My current symptoms
Right arm-- This is my drawing arm and where it started. Primarily pain in the elbow on the inside, occasionally moving up the arm to the wrist (although the wrist has not been bothering me lately) and very often the middle and ring fingers. Doing pretty much anything at all with these fingers, sometimes also involving the pointer finger, causes pain in these fingers and/or the elbow. Elbow and wrist movement also aggravate it. Pain also comes and goes randomly. I've taken to taping my pointer, middle, and ring fingers together often to avoid provoking them. Fortunately the thumb does not seem to be affected, so I can still grasp things somewhat.
Left arm-- Not as bad as the right, but gives me trouble as well. This one has pain randomly on both the outside and inside of the elbow. I'm sure the pain on the outside is from straining it back in July overcompensating for the right. Unfortunately it's pretty much impossible to completely rest this arm since I have to live somehow. Recently it started showing symptoms similar to the right, including the finger pain, which is when I decided to put the full stop on drawing. If you don't see me in chat on any particular day, it's because the left arm is bothering me too much despite the foot pedals and voice recognition, since I don't touch the computer with the right hand at all.
What the specialist thinks
Most doctors that I've seen admit to having no clue what is going on. MRIs and EMG (nerve tests) have come up normal. The specialist I most recently saw thinks that the pain is from gradual wear because of the synostosis and is something I'm going to have to live with. I'm not terribly convinced by this because doing some research on this does not suggest pain is a common thing. Plus he was doing things like grabbing my right arm and saying "I'll bet this has been causing you pain on the outside of your elbow" and I was like "noooooo, that one is the inside."
What I think
Except for the finger pain, the right arm displays a lot of characteristics similar to what I've read about medial epicondylitis, or "golfer's elbow". The left arm additionally seems like both this and lateral epicondylitis, or "tennis elbow". Reading accounts of these, it's not uncommon for these conditions to take up to 12 to 18 months to heal. I also see some similar reports of doctors not knowing what to do when confronted by these symptoms. There is probably something additional going on with the fingers, especially since many videos of stretching exercises I've seen involve a wrist stretch where the wrist is pulled back by grabbing the fingers with the other hand. Trying this caused significant pain for me way back in June, so definitely won't be trying this again. It's possible that because of the synostosis, some tendons are weaker than normal or something. Another problem is that many of the exercises out there to help treat these elbow problems require rotating the wrist, which I can't do.
The current plan
It has been seven months since I was first afflicted with these problems. I've taken a few several week long breaks, but have been mostly continuing to lightly draw during that time. I've stopped drawing completely for the past month, however, and to be honest have not been pleased with the results (although to be fair, the recent bump in the road was probably caused by stepping up the drawing too quickly in December). However, I plan on taking at least another full month off before making any decisions. In the worst case scenario, I'm going to just grin and bear it and draw anyway, but that would be several months of no improvement first.
Really, I just need one arm to completely heal and I'll be fine!