Suzie,
I had a day like that yesterday. I was in a terrible, horrible, agitated mood and I couldn't figure out why. I could barely sit still. It was not a normal physical feeling. In my case I believe it is PAWS. In fact yesterday was the first real days in four months when I had to remind myself: No way. No how. No drinking.
I am feeling much better today! Isn't it nice that bad, terrible, horrible days pass and we don't have to drink over it? I was so happy to not be hungover today.