Hi, I dont understand, was this a combination of MMR and another vaccine or a double dose of MMR. Has your son an intolerance to eggs as I know egg protein is used in the MMR vaccine. Did your doctor say the lymph nodes were related to infection, if so, has there been any improvement since starting the antibiotics. I'm sorry cant offer much help, I decided against vaccination, as my mother also decided for me. If your doctor is with a group surgery I would take your son to a diffrent doctor in the group. Bathing him with diluted apple cider vinegar is very good for bringing down fever, and swollen lymph glands. It must be so worrying for you, I hope someone can offer some reassurance who may have had similar reactions, hope he gets better soon.