Why is my thumb numb?

So I play the snare drum in marching band and during percussion today I was holding my drumstick and I all of a sudden got a sharp pain in between my index finger and thumb, where you hold the stick. I had to keep playing though and after class I noticed that my thumb is all tingly and I can barely feel it when I... show more So I play the snare drum in marching band and during percussion today I was holding my drumstick and I all of a sudden got a sharp pain in between my index finger and thumb, where you hold the stick. I had to keep playing though and after class I noticed that my thumb is all tingly and I can barely feel it when I touch it. I thought it would stop after an hour or so but it has been almost 8 hours. What would be the cause of this? Is there anything I can do to fix it, thanks for the help!
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