I've been dealing with a crazy cold that swept through my house last week. One thing I royally neglected while sick, was my water intake. I know how important drinking adequate amounts of water is, but when you feel like garbage, drinking water doesn't always work out well.
But I felt a drastic difference once I started increasing it back to about 3 liters a day. Amazing how just one tiny change like this can improve everything in your body...guess it may have something to do with the whole thing of being made up of 80% water?? ;-)
So, pay attention to your water intake...it may take you from feeling like shit to not and that my friends is always a good thing!