b12 injection sick feeling Why do I feel worse after a injection? How Can Vitamin B12 Shots
Description
All of these are very normal feelings for just having gone through such a catastrophic event, but the good news is that all of these feelings are also very easily treated

Atencion Primaria 2004;34:509 (author reply 509)
Air is one of the things I worry about, I hate losing one drop of b12 to aspirate

doi: 10.1093/ajcn/85.5.1185

However, some people may rarely have side effects like redness, itching at the injection spot, or mild diarrhoea