vitamin b12 injections headaches Common & Rare Side Effects of Why Do I Feel Worse
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I don't know if the same applies to the pharmaceutical industry or if it is more strictly regulated

Four types of long-acting HIV prevention are in development and testing in research studies: intravaginal rings, implants, injectable drugs, and antibodies

The FDA has documented cysts, knots, and permanent scarring in recipients of unapproved fat-dissolving injections

I had similar but not as excessive as your experience

If you haven't done it already, I think it's a good idea to track down the local B12 deficiency guidelines used by your ICB (Integrated Care Board) in England (Health Boards in Wales/Scotland)
