Does this match your symptoms?
https://www.spinemd.com/symptoms-conditions/carpal-tunnel-syndrome
Based on the SNES and combos, this would be my first, non-professional, "internet is dangerous" kind of assumption.
Ibuprofen (Advil) might help as usually the tightening is caused by inflammation. At least until your appointment.
Also, you might need to start stretching before any more SNES/Street-Fighter competitions.