I don't know what you described is heartburn nor do I think it was a heart attack. It sounds like from your description the "heartburn" went away after chilling on the bench so if that is what you are saying then I wouldn't say that is heartburn. Did it feel like you were breathing fire or was it more of a sharp pain or a crushing pain or a tightness or radiating pain?

Do tell more but food can cause heartburn but I wouldn't say Cheetos would be. It has a lot of artifical cheese flavoring (which is delicious!) which may have some calcium (calcium can cause an increase in stomach acid) but more common foods that cause heartburn are citric foods or juices, tomato based foods, spicy foods, chocolate, things that are acidic.