I'm starting to think something is wrong with me

I was in the store earlier walking and my heart began racing making me really dizzy and sick. I slowed down and stopped moving. Eventually I went back to normal. I walked slower and it didn't happen again. It's not the first time something like that has happened.

Part of me wonders if I somehow wrecked my heart when I had an eating disorder. I say that because then I would get dizzy spells, palpitations. Nobody really has heart issues in my family. Normally it's stomach and lung issues on both sides.