I recently had a pacemaker installed due to heart block. Prior to the surgery I experienced no symptoms. No fatigue or lightheadedness, in fact I didn't even know there was a problem until the EKG. Since the surgery, I am so fatigued and have a pins and needles feeling in my head and neck. Last week I was told that the top portion of the pacemaker was not working, but that I didn't need it. I also have a problem with low magnesium, but can't seem to find one that raises my level without causing diarrhea. Any ideas? Should I have them redo the surgery if the pacemaker lead is not working?