Oh gosh, eating disorders are so hard. There is a forum for that here specifically, fyi. I do think there are clear risks for being anorexic in relation to your body systems. This doesn't mean you are going to . . you know, drop dead today or anything. But it's something to be mindful of. The underlying issue is anorexia, right? What is happening to help you with that disorder? tell me more, I want to help support you sweetie.
Just to let you know, heart failure is when your heart stops beating. Obviously, that's not you. You might have covid. But anorexia leaves you severely malnourished, and so if nothing else is found if you are currently anorexic, and you don't say how tall you are but that's not a lot of weight, that's the thing you need to pay the most attention to and fix.
I just thought I'd link the eating disorders forum here. https://www.medhelp.org/forums/Eating-Disorders/show/165 I
hope you come back to talk to us. hugs