I have been experiencing these "episodes" for exactly one year. Out of nowhere,my heart will start racing,my face gets flushed,and my body gets extremely hot. I then have extreme diarrhea until everything has been expelled from my body. During the diarrhea, I go into a "seizure" rocking back and forth, breathing heavy,making grunting noises. When the seizure is over, I come to and my body becomes cold and chills and shivering occur. Episodes last about 2 hrs total. I have been tested for Chrone's disease, carcinoid syndrome, mastocytosis, pheochromocytoma,and acute intermittent porphyria. I have had a CT Scan and MRI of the brain, an ultrasound of the stomach,a colonoscopy, a bone marrow biopsy, a bone scan, and every blood test imaginable. Everything comes back negative. I am being passed from Dr to Dr with no answers. These episodes occur about once every 5 weeks or so. I am taking the following medications: Nexium, Cyclessa (birth control), and Dairy Care (for lactose intolerancy). If anyone has any ideas of what this could be or if you have had a similar experience, please help me out!