One thing that I didn't mention in the post was that the last time I had taken pain-killers before all that was around noon. And the last time I had taken any with codeine was about noon on Wednesday.
Also I think I forgot to mention that I have been sick all week. And the stress and late hours weren't helping me recover from the touch of the flu that I had. Friday was the worst.
I guess there would be a question of whether the way I felt on Friday was a hangover or the flu. However, there are a couple of factors which point towards the flu. First, hangovers get better as the day goes on and do not generally give you a fever. I kept feeling worse and worse as the day went on and had a fever of over 38 C (over 100 F for the Americans out there)
However, after sleeping (on and off) for about 16 hours, I seem to be over most of it. And my fever has broken.
I am still going to take a couple of days to myself. I might check my email, but probably won't reply right away. (I heard that "When do you ever?")