Although you are very young for such things - have you ever been tested for thyroid function?

I found a great improvement in my ability to play the guitar once I was diagnosed with a failed thyroid - I went from not playing at all to how it used to be. I mentioned this to someone I meet once a year, who had had painful wrists and hands for over ten years - a year later I saw her on stage playing again too. At the end of a song she waved at me, tapped her throat and wiggled her fingers - which I assumed meant that she too had thyroid problems which had been resolved.

These days - after many years of treatment with Thyroxine, I no longer have the gristly noises in the wrists which I heard for years when I tried to ease them into motion, and my hands are flexible and strong - I can crack walnuts in my bare hands.

Low thyroid function can be difficult to diagnose, I had several tests within the normal range before one day it was suddenly found to be dangerously low, but it might be worth a test just to see if anything is wrong there.