(sorry posting for traffic)
I had my yearly health check this morning and got my flu vaccination at the same time.
Now, two hours later, I have a rotten headache. I am sinus-y, achy, cold and tired.
Last year I felt rotten for a couple of weeks afterwards too, but can't remember how quickly symptoms came on.
Is it possible that I am reacting to the vaccine already, or is it just psychology or coincidental timing?