None of us are Dr.s on here so we can't diagnose you...(Even a Dr. couldn't do this online)...
So yes...you need to go visit your GP...They will take an x-ray just to check for any fractures...
You will most likely need to wear a thumb brace..
Taking Advil is the best medicine as it's an anti-inflammatory. Just follow the directions on the bottle.
Go and see a docyor hun. I broke a finger a few months ago and didnt know it for a few weeks before i decided to go for an xray. Get yourself to the Dr without delay... if its broken and you continue to leave it it probably wont set right. good luck x
Oh and certain ways i move my thumb it hurts but for the most part moving my thumb doesnt hurt.. same thing happened when i broke my arm...