I found out last wednesday that I have a B12 deficiency. I had been getting headaches everyday for a month so I went to a neurologist and I got a catscan done and she also tested my B12 levels. Well, they came back and the scan was fine but my B12 levels were less than half of what the normal levels are. So I have an appt. to go to my primary doctor next week, but I was wondering if anybody here has this. The headaches came with nausea, fatigue, lightheadness, and I felt tired all the time. I started taking B12 dots, but if my body cant absorb it then I might have to get the B12 shots. Well, I read about Nascobal Nasal Spray for people who have B12 deficiency and I would much rather do that. Has anybody here used it before? I guess that B12 deficiency can cause a whole list of problems.