MaMa,
I hvn't heard or experience the same case but for safe sake, I think you shd see another doctor. Need to find out the problem and proceed certain therapy asap.
Also, did yr doctor said it is the reaction of injection?
Don't worry, my BB also had the MMR shot on the 20th of March. We also found a swollen lymph behind her neck. Called our doctor and he told us whenever there's some kind of virus attacked bb's body, there'll be swollen lymph node(s). The lymph glands produce white blood cells in order to "fight against" the virus and that's why BB gets swollen lymph nodes. BB under the age of 10 always have swollen lymphs, that's what the doc told me. See this link on the side effects of MMR shot: http://www.wellsphere.com/wellgu ... accine+Side+Effects