Can low vitamin d be causing my symptoms? been having leg twitching and calf cramps for a month along with pain under my left and right ribs.

Vitamin D: Unlikely the cause of your symptoms. Tell your doctor your concerns, you will be examined, and labs drawn. While waiting for the results you can by over the counter vitamin D (1000 or 2000 unit tablets/capsules with 100 per bottle). Not expensive and take one a day. Once you have the lab results some change may be needed but I expect not.