i have this diagnosis as well. I causes intense chest pain ( inverted t waves on EKG) and I have also had episodes where I felt like my heart and throat were being squeezed and a intense burning sensation along with it - my dx came from a tilt table at cleveland clinic when I was there for testing and acute EKG changes caused them to stop test and call a cardiac rapid response.... talk about embarrassing! in any case, i started on norvasc after that and it helps a bit but it does not prevent all episodes. I find the more stress I am under the more likely this is to happen. The cardiologist i see brow beat me until I quit taking midodrine - she insisted that the moddrine and norvasc where at odds. My understanding of midodrine is that is acts on peripheral vessels - ( I have considerable blood pooling) - in any case, even not taking midodrine I still get CP on and off - I have rx for nitro just in case... you should be as proactive as possible to avoid stress - careful with exercise - drink enough fluids etc...