I HIGHLY recommend getting a nerve fiber density test, which is done by a skin biopsy.

EMG does not detect small fiber neuropathy.

As to whether it is traumatic or not, that is going to be hard to determine, but, at least you would know what is going on.

It sounds like your hands and arms are OK?

One more thing, on the pain.....trochanteric bursitis can radiate to the gluteus medius....it is hell on earth. I have it in both hips and now my doc does not want to give me any more cortisone shots....he wants to take them out. This is an issue since I have connective tissue disease, and surgeries or interventions form more scar tissue. Anyway, bursitis burns like the devil! It sounds like you have multiple stuff going on, but this is just another consideration given your rump pain. I can't even touch my backside with my finger without having hideous pain....I am sitting on a donut.....far cry from my sprint triathlon days.....way far cry.

You are so young for this junk.....keep pursuing an answer!