Inky- this is pretty serious. That's the beauty of doctors though. Legally they are unable to spread your business to other folks. So what you tell your Doc will be kept amongst you. I think you have to share this because eating disorders do effect the heart, and can cause some irreversible damage. Obvisouly you're already have heart problems, so these problems you have are probably making it worse.

I hope you get the help you need and you gain the courage to share these medical issues with your doctor.