Okay, so for several days I have been under heavy deadlines...to make matters worse my medication got changed from nexium to prevacid which is not working at all, added zantac which is not helping..insurance wants me to try it, before they will continue to pay for nexium..so anyway..I was off coffee for 10 months pre op..started back on half caff. at 3 months post op, then went back to regular. I usually only drink a couple of cups in the am. The culmination was yesterday and today...I must have drank 3 pots of coffee racing against and impossible deadline, which I made...Today...I still had more to finish up on the project. So, I never ate till about an hour ago, just some soup, never drank much water and now I am having wicked head rushes..they are so bad I cannot stand and can hardly sit at the computer..I think that I must be dehydrated. Anyone else back on the coffee ? Anyone ever had bad dehydration, would that be what the head rushes might be from, I am also terribly nauseous also....okay, I know I did this to myself, but, would appreciate some feedback.