The amount of B12 absorbed orally is so small. I don't see how you could be having these extra symptoms.
I'd see a doctor and make sure you don't have some other problem. Get an EKG, and a complete check up.
There is a blood test that checks for antibodies to parietal cells in the stomach, which make intrinsic factor.
Also get checked for H. pylori infection. This can give all sorts of weird symptoms.
Seeing a doctor is a good idea at this point.
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Weezie looking at petunias 8.25.2017
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