Has anyone had a reaction to the flu shot? About a month ago I had a flu shot. Since then, I've been having hot/cold sweats unlike ever before. (I've been through the worst of menopausal hot flashes over the past 3 yrs, so have ruled that out for the mostpart.) During one of my "burn ups", I took my temp: it was over 100, which is very high for me since my "normal" is 95.7. Out of town, I e-mailed my doc who said I was prob having a reaction to the vaccination based on the hot/cold sweats, but if the fever continued for more than 3 dys to see a Dr. The fever comes & goes, so I'm not sure what to do. Any ideas on how long this will last???