You could ask your doctor aobut using Prozac instead of Celexa. Celexa is not the best choice for someone with POTS. Prozac is activating and can help with fatigue, Celexa on the other hand will put you to sleep. I have had hyperadrenal POTS for a long time, and have had good results with a combination of Beta-blockers, Prozac (1/4 to 1/2 of a pill), and Provigil. Provigil is better then the stimulants for fatigue as it dose not effect Norepinephrine as much (like we need any more of that). However, I think you really have to experiment, since we each have slightly different underlying causes and degrees of dysfunction. What ever you take start at a low dose and work your way up, we tend to be over sensitive to many medications. Don't give up on the search for the right medications, trying to control Pots with life style changes is like trying to fly without any wings, you are just bound to fall. As an aside I just did a squat and stand without blacking out, or even getting dizzy. In the past when I went to the library and realized that the book I wanted was on the bottom shelf, I would just go find something else. It was almost an unconscious decision.