Hi...actually Home With Flu...but That Isn't My Question. :) I

Hi...actually home with flu...but that isn't my question. :)
I am a choral director/piano player, and have been playing a LOT of piano to get ready to play for my son's senior college opera recital. I have some osteoarthritis but it usually isn't a problem. the outer part of my left wrist has become as though I injured it in some way, and I'm sure it's from overuse. I had my daughter pick up a brace for my wrist and, since home sick, wore it for 24 hours and this a.m. it actually felt worse. I think it stiffened up a bit. No time to see a Dr., and was curious on thoughts as to what to do going forward so as to not make it worse! Thank You...