I am 40 year old female who weighs 115 lbs. I have normal cholesterol and lower end BP . I also have Postural Orthostatic Tachycardia Syndrome . Five months ago, I had a clear angiogram done. The results were that there were no blockages and my arteries were normal. However, for the past month, on and off, I have had episodes where it feels like I cannot get a good breath. I have also had nausea sometimes with this symptom. As part of my postural orthostatic tachycardia syndrome, these are normal symptoms, however, they are new symptoms for me. My question is, how long is a clear angiogram good for?