Forearm pain down 2 fingers with ocassional cramps what would cause this ?

Depends: With your history of major procedures for nerve pain, you have to distinguish old from new, and the possibility of overuse of an arm with chronic weakness. Seek your physicians help in obtaining physical or occupational therapy to maintain proper posture through the day and with your duties at home. New pain may require an EMG to clarify your medical treatment. Good luck.