I am 59 years old, overweight but otherwise in good health. I exercise at least 3 days a week for 30 minutes each time. Over the course of the last year and a half I have faintedon 5 occasions. Most of them occurred either right before or right after a meal. I get only a few seconds warning (a strange, rushing, painful feeling in my head) before I lose consciousness for about 10 to 20 seconds. When I wake up I feel very tired, am often nauseous and sometimes vomit. I've had blood tests done, an EKG, an Electrocardiogram, an EEG, a CAT scan and an MRI of my head. My doctor is at a loss. Do you have any suggestions?