Im injured but i dont know the injury

https://preview.redd.it/8qqabnmgbabe1.png?width=1269&format=png&auto=webp&s=89c05dde817d18a9246c7bcbebe830720becbb17

So I feel unbearable pain in this three muscles of the thumb of my right hand when I aim, just when i aim, not before or after. I've taken several breaks from the game (being the longest 1 week) but it still comes back when aiming. That muscle just feels stiff and sometimes I even pause the game mid play because of the pain. Should I visit a physiotherapist? Or it will just go away with time? Also want to know if someone else has experienced this before. Thank you.