Hey i was playing the main riff from New Born by Muse which in tab is
G-------9--------------------------------
D---------7-9----------------------------
A-----7----------------------------------
E-----------------------------------------
You just repeat it and go down the neck, but anyways when i started playing it i started getting cramping pain in my left hand with the pinky and ring fingers. When ever I play now i cant play with my ring and pinkey without gettin that pain again. It sometimes is there even when im not playing. If anyone has any ideas what is causin my pain

Thanks