Hi Nat,
I think my version of RSI/TOS has become some sort of myofascial syndrome.
Started out in arms & hands mostly, then spread into neck, shoulders and upper back and now low back, hips, legs, mainly I just get a bit stiff and achy if I stay in a position too long. I have to move around to be comfortable.

What kind of symptoms are you having now?

Have you found things that work well for you?