Toolgirl, I felt that way until I caght the flu for real. Not a cold that I always thought was the flu. Colds I could fight through. The year I got the flu I couldnt even stand up for 3 days, and felt like crap for about three weeks, there was mucho vomiting and really high fever, and cramps for days on end. I used to wonder how 20,000 people died of the flu every year, well when I found out what the real flu was like, I kne how they died.
My recommendation, get the shot, it's cheap and a little fever and a crappy feeling is nothing compared to the real thing.