If you are younger, under 25 it could be neurocardiogenic syncope. I have it. You get really dizzy and can or will eventually pass out. Your symptoms are how I started out and it got worse until one night I passed out and was out for hours. You definitely want to get it checked out. A cardiologist will do a stress test on you and that will probably be the most telling. My symptoms are worse in the summer, especially in the morning. My doctor has me on a beta-blocker which is actually designed for people who have high blood pressure. It keeps your heart rate from becoming so eradic. Take your time getting up and drink a lot of gatorade. I promise it will help! Don't push yourself!