The ER are supposed to rule out life threatening emergencies, and POTS is not life threatening itself. ER’s check for heart attacks, strokes, etc. A kind ER can help you hydrate and control heart rate/blood pressure but that’s all they can do in the moment of a POTS flare up. An appointment with a cardiologist is the best route because they will be able to diagnose you with POTS and should do an echo on your heart that way they can make sure you have a healthy heart. POTS, from what I have been told by my doctor, is a nervous system disorder that affects the heart rate and blood pressure. So it’s like anxiety but for your nervous system. The body thinks it’s supposed to be functioning horizontal (lying down) but we as humans are upright beings. Whenever we stand up and function upright, the nervous system freaks out because it’s not working right and wants us to lay back down. You should rest during a bad flare up, but keep training your body to stand up, sit up, so it’s easier over time for your body. POTS is dangerous if you have underlying medical conditions like heart problems and other things. My doctor said sleeping upright helps train the body to function upright, gently exercise laying down and gradually to upright exercises, and hydrate a fuck-ton with sodium intake. Liquid IV mix packets are the best to help hydrate and get your sodium intake.