Right before and after most bowel movements my face, ears, and arms turn bright red and heart rate increases. Sometimes I have bouts of excessive urination and urine is completely clear and have urge to urinate very often. I also turn bright red when stressed. I had 2 abdominal CT scans and ER Dr only found an inflamed valve in colon and said IBS. Also did EKG in ER and everything ok. Few years ago with same symptoms had endoscopy and colonoscopy, long term urine test done, and blood sugar tested, all negative. Any ideas what could be causing these episodes?