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Rick, Although not a doctor yet, It doesn't sound like your experiencing a true vesovegal "attack". It sounds to me more like an anxiety problem if you have the ability to work yourself up to it. Let's start out with some basics. Theres a nerve called the "veso" nerve. This nerve runs right through your heart, and connects with the muscle that tells you to bear down when your having a bowel movement. A typical episode would happen when someone bears down (which in turn slows the heart down by putting pressure on that nerve). When your pressure drops, there is another effect that dilates the blood vessels usually in your legs, however generally your extremities. (your legs just happen to be closer to the ground). When this happens, blood rushes to your legs, rather than your head. You pass out as a protective measure because your body will be laying flat therefor your body can "reset" itself. If this happens a lot to you, contact a doctor, or 911. It may be something more than just a vesovegal. Hope this helps.