Side effect from B-12 shot? OR

I now after 1 yr. and 1 mo. post op. have to take a b-12 shot. I have to take the shot 1x a week for 1 mo. and 1x a month there after. A strange thing has been happening and just thought it may be a bad side effect from the shot. First off the first shot was give to me on Wed. the 21st. then Wed. the 28th. The shot on the 21 first made me tired and then by Friday I was on turbo speed LOL. But I was noticing in my left arm on my vein it was really putruding out ward like I was getting ready to have blood drawn. I have a bad pain in it all the way to my wrist. Then the pain went always by sun. Then on Wed. when I got the new shot I am going threw the same thing swollen puffed up vein with pain with pain. I do not take this shot in a vein it goes in the muscle. The first shot was in my Rt arm. the second shot was in my Rt. hip. So why the pain in the left arm in my vein? I am thinking I should be seen for this. Anyone have this problem. I have so much energy it's scaring me

I have never heard of this. You should call your doctor. Why are you taking B12 shots? I take the B12 orally-right now in liquid (YUCK) form as I'm only 3+ weeks out from surgery. Can't you take B12 pills? That's what I'm planning on doing as soon as I'm cleared to swallow pills whole.

WOW I would really call your surgeon and ask. I know my surgeon has us take b12 shots monthly. He feels it is the best way to absorb it. Take advantage of the extra energy and send some my way. Chryssie

It can't hurt to let the Dr. know, but I don't think it has anything to do with the shot. If it were a local reaction it would have been in your butt where you got the second shot. Maybe there's something else going on like carpel tunnel that coincided with the shot. If it happens again(with or without the injection) I'd seek some medical expertise.