I have been having this problem for awhile....Out of the blue I will get severe stomach cramping and pain and have to go to the bathroom. Sometimes I am not home, or driving and trying to get to the bathroom, and I develop a severe headache on top of my head and severe throbbing in my teeth. My face turns beet red and my eyes are bloodshot. When I am on the pot, I am sweating and nauseated and don t know if I m going to throw up or have bowel movement first. I m weak and have to lay down in the middle of all of this. I am almost 68, female. Also, the past couple of years, during sexual arousal, I get an instant severe headache. I am worried I am going to have a stroke with these symptoms. It seems vascular. I am on benazepril for blood pressure.