Hi again, I just wanted to thank you all for your responses. You guys are the best. It's great to know that no matter what happens during the day, I can come here and be understood, and that means a lot. I just wanted to mention something. I had recently been exercising on my treadmill, but I stopped because it was just making me extremely tired. But then today in gym we went to the fitness room and I remebered something my doctor, who also had POTS, told me. It's actually pretty simple, and I can't believe I never thought about it before. She mentioned that the reason why I was having so much trouble excercising was because I was standing on a treadmill for 20 minutes and that an exercise bike might be better because i'm sitting down. Well today in gym I tried the bike, and let me tell you it was a world of difference. It just seemed so much easier and-I wasn't late to lunch! I guess that means I wasn't that tired! Thanks again, guys. I'll talk to you soon. Lisa