I have had carcinoid syndrome symptoms for a few years. Had many blood tests and urine and scans, scopes first couple years. All neg. but I continue to have GI problems, I get flushed hot face, chest not as bad as face both feel hot like sun burn. My heart rate goes up though not severely and I can feel it pounding and sometimes skip beats. I had echocardiogram in 2016 normal. Nothing shows up but I know my symptoms are very abnormal and it is hard to eat.