Okay. I'm 17 years old, 118 lbs. I'm 5'6 and active. I am having some heart problems I believe and I need to know what to do Asap and what it could be. So my symptoms consists of: fainting when getting up to a standing position (I have a little increase of heart rate and blood pressure but not significant HR: 120's while standing) feelings of heart beat stopping then starting, extreme heat intolerance. I take a hot bath and my heart rate goes up to 180 most times and I feel quite dizzy, short of breath, shaky. I get very tired during exercise. I can hear my heart beat in my ears during exercise and get very short of breath. (I have asthma also, but controlled, and sob not from asthma) I need to know what this could be immediantly. Thank you