It would be helpful to have more information about you, your age,
risk factors and condition. Having said that, you have had about all the tests there are and been checked out pretty well including a CT-Angiogram. Heart disease rarely causes pain at rest, usually during exertion. I don't know what he means by acidity, is he talking about indigestion?
In any case, if you're still concerned about your symptoms you could always get a second opinion.