Hi, im a 20 year old female, and over the last 2 years ive experienced four scary episodes of something that i need help figuring out. It usually happens when i start my menstrual cycle, but it has happend without me being on it also. I get menstrual like cramps, that remind me of pregnancy contractions. Im not pregnant though. the cramps get so severe i start shaking and cannot stand up or walk, i must lay down. I get clammy all over to where my cloathes are soaked in sweat, and the cramps will come and go but usually lasts about an hr of really painful cramps. I have thrown up before also right before the cramps started. Please help me explain these scary symptoms. I also suffer from anxiety and depression. and i get sick a whole lot compared to most people i know. Thanx!