My daughter had the nasal flu vaccine on Wednesday. When she got home, she said she had a headache. I gave her Tylenol. She was fine. That evening the lympnodes behind her ear and upper neck swelled to the size of golf balls. No exaggeration. I took her to the MD on Thursday morning. No strep. No mono. And her cbc is fine but they sent me home with an antibiotic. Before we could leave the office, my daughter starts complaining of a headache then she starts crying and screaming then she vomits. She feels a lot better. It is now Saturday, the swelling has not went down or gotten any bigger. Whenever she starts getting a headache, she starts feeling nauseated so I give her Tylenol about once a day. She has a low grade temp of 99f. She can turn her head and neck fine and it does not hurt to touch. What is this and what should I do. She is eight by the way.