I decided to go on to see my doctor. Woke up more lightheaded than usual. I will take her breathing tests and talk about everything. No tilt table though. I forgot to answer your question. I take 1 1/2 tsp of D-ribose 3 times a day. The Carnetine once a day. About 1/2-1tsp. I like CoQ10 too. These have helped my fatigue so much that I have to sometimes take less or I do not sleep as well. I LOVE having energy again. If I could just get this stupid POTS to heal. I see it all as a challenge. I can't wait to learn more and feel better and WALK.