Just research as much as you can - search everything on it on the internet, most medical 'professionals' will have read maybe one or two articles and think they know everything.... you will find a handful really who are true experts in the field and will admit that they do not know everything but are always looking for more answers - THEY are the ones to listen to and look for......
Take note of all your symptoms, your HR, what sets it off with the changes, your BP, whether its changes in weather, foods, stress levels, etc that change things for you, your dizziness, pain levels etc - just track it all ...... It can be your life saver if you have to go to your doc or to the ER for some reason with it..... Keep a folder with all your discharge notes, along with the symptoms etc and make sure you take it with you - have your current meds, current diagnoses and whatever else you can think of.... its all helpful.
If I had had those notes and stuff with me to start with - I think I would have been taken more seriously than I was initially.