My body has no internal thermostat either. I don’t get pounding so much as muscle tremors and pulses in different spots at times. I have some known triggers but other times it’s a mystery. Last winter I slept with 4 comforters and my infrared heating pad on my bed. This winter just a regular blanket, but will be freezing sometimes and then have hot flushes when I have to throw the covers off my legs or I’m going to suffocate. The joys of dystautonomia.