MRD - I've never gotten a flu shot, but I know a lot of people who have, and some of them did say they felt kind of crummy a few days after. It makes sense, as when you get a flu shot, you're actually getting a weakened dose of the flu so you can build up the resistence to it. Most people say it's not nearly as bad as the flu and doesn't last as long. I hope you're feeling better soon.