metallic taste, both arms went numb and I became weak and shakey, my breathing stopped dead for about 4-5 seconds and came back with a gasp, then I had tremours, horrible heart pain and weakness/brainfog/tingling/burning that comes and goes, second day i had vertigo then partial paralysis for a few hours and could not wipe nose or type, it slowly faded, that night I had cheat pain, burning nerves, horrible waking delusions for about 45 min like i was intoxicated, that passed, heart pain has not, weakness has not, tingling weird electrical buzzing comes and goes, scared to get the second shot, scared because nobody is reporting these kind of reactions, scared because they say it doesnt happen, scared because there is no suggested treatment, scared I will have a heart attack or be paralyzed while people insist I must be making it up S D there is a group of us just like you, ask Danice Hertz MD to add you to it on FB That sounds terrifying Im sorry you had to experience that

Nygrd O, Refsum H, Ueland PM, and Vollset SE (1998)
Vaessen N, Heutink P, Janssen JA, Witteman JCM, Testers L, Hofman A, Lamberts SWJ, Oostra BA, Pols HAP, Van Duijn CM
Vitamin B12 is also known as cobalamin