Dysautonomia International has some great resources on POTS! http://dysautonomiainternational.org/conditions.php?ID=1

Main symptoms of pots are dizziness, fainting, hot flashes, nausea, blood pooling, etc. There’s a lot and everyone’s is different. You could possibly get a diagnosis from a cardiologist. I got mine from a neurologist. Getting diagnosed can be difficult because a lot of doctors don’t know about it.

Look on mayo clinic or cleveland clinic. They have so much information on it