About 10 years ago I had gastric bypass. Two years ago I had to have a blood transfusion because of iron deff. Other than that one problem things have gone great. I think I ended up loosing around 170 lbs. In 10 years I've gained 10-20 lbs. Loosing and regaining. When I had my surg. I was told to get a b12 injection every three monthes. I have complied. Over the last few monthes weired things have started happening to me ( very tired all of the time, rapid heart rate, hands and feet tingle and actually stay numb, been dig. with panick att., see spots like I have been looking at a bright light). I have been to countless doctors all with the same answer. These symptoms are phsycological. I just happen to do some research into vitamin diff. Could b12 be my problem?