My big-toe nail is about to fall off? helppp?!?

Okay, so I haven't injured my toe in any way shape. Yes, I am active and sometimes with tennis my foot jams in the front of my sneaker but it never could cause this, right ? I am wondering if I should pull it off or let it be ? It hurts SO BAD! Any ideeas on how to get it off faster? The whole bottom is unattached its attached by a bit on the one side and almost the whole other side I can't take any medicine either. Help!