I tried to search to see if I could find anything on itch after a year and pain after a year ago shot. I couldn't. I would call the office where you got the shot. I think that is your best bet to find out what is going on. I'm sure that is a frustrating after all this time. I read that it CAN happen immediately following but it has been a long time now. So, call the place where you got the shot and report this for guidance from them. good luck