If i grip something for too long or too tight i get terrible spasms and my fingers contort. i even had nerve decompression surgery.

Please see doctor: It is hard to tell without an exam whether what you are experiencing are muscle cramps or a less common condition called myotonia. You definitely need basic blood workup including electrolyte levels (k, ca, and phosphorous), thyroid/parathyroid function, and muscle enzyme (ck ) levels. Depending on your exam, your doctor may also choose to perform an EMG test for your muscles.