B12 injection and migraine
Can B12 injections cause violent 11 day (one dr. visit along with 2 emergency room visits to break it) migraine headaches in a person who has been diagnosed with the hereditary form of pernious anemia and who has to take the shot every month. I was diagnosed 20 years ago and have done the shots every month since then.
I never connected this before but it seems that about 3 days after I take the shot I get a violent migraine that lasts for days and days and days and takes emergency room pain killers to get rid of. When its gone I am totally fine. What does the injection change in the bloodstreem that would cause that. Please respond. Thank you.