Suggest Remedy For Tingly Muscle Spasm On The Back Of Left Leg

Pulled Hamstring?
I think I may have pulled my hamstring...it feels vaguely unpleasant, tingly, and slightly spasmy along the back of my left leg it starts by my butt and I can feel it all the way down by the back of my knee. I can walk normally and its not swollen but I can't stretch it as far as normal before it starts hurting and I have to stop. When I did it I didn't hear anything pop or feel any sudden pain I just felt a slight twinge like when you stretch a muscle you haven't stretched in a long tim and push it a bit too far. I'm 16 and I need to get my flexibility back to where it should be before dance starts up again.
Do you think I pulled something? If I did how long will it take to recover and is there anything I can do to help it heal? Will it recover as flexible as before?