Light headed feeling when I drink water, BP around 104/73, urine a little dark, last time urinated 8am now noon and have no urge to go. Dehydrated?

Dehydration. Yes. Probably you are dehydrated. Drink plenty of fluids. It need not be water. You can drink fruit juice, soda or lemonade etc. Some people complain of dizziness after drinking cold beverages, which could cause vagal response. Drink fluids at room temperature.