can be used for multiple purpose. it found to have some cancer protective action in some study. anyway. 1000 mg l-arginine rarely associated with side effects you mentioned. you did not mention from what cancer do you suffer. anyway your symptoms goes more in favor of hyperacidity
. tear in esophageal lining may also be the cause. upper G-I endoscopy
is needed. for the time being you may use ulceroprotective drugs. consult your doctor.