Is your pee dark in colour? Maybe you are getting a bit dehydrated.
I once got similar symptoms after completing a long wallk and running out of water half way through the day. It cleared up after I sank two pints of orange juice and a pint of lemonade in the pub. By the time I was on my second pint of beer everything was fine!
Yes it is rather dark and a bit smelly (hope nobody is eating their dinner eek). And I had a stinking headache before and after I went to bed. I was also wearing a new make on bib short for the first time.