I don't think it's a coincidence that flu rhymes with 'EWWW'. That's pretty much how you feel when you have it.
Try as I might to avoid the flu, it finally caught up with me last weekend/week. Fever. Chills. Body aches. General-all-over-yuckiness. Saturday afternoon, Sunday, Monday and Tuesday were all a complete blur. By Wednesday I was feeling a bit more human, and by Thursday I was finally back at work. All I can say is: WOW. Avoid it at all costs if you can.
On the upside: last week was cold and it rained buckets! If you're going to have the flu, I do recommend that you have it during inclement weather. At least you don't feel bad about not being able to go outside!