Replying to I hurt my thumb, and I need medical advice

It starting hurting like 3 weeks ago and it got worse. I don't know what I actually did to it, skiing probably. Jammed, pulled, idk? But i can't curl in my thumb all the way or it hurts way too much. I feel like a sharp pain on the back of the thumb at the base.

Anyone might know what happened?
Should I go to the doctor?
Is it gunna go away or am I gunna need like a splint?
should i wait till the end of ski season, or is only gunna get worse?