I am in fair to good shape. I have allergies in the spring that cause my eyes and throat to be irritated. A few things I would like to mention first. It was a great idea that you went to the doctor. You are right to never ignore chest pain which may be a heart condition.
Cardiovascular disease is the number one killer in the USA, and, in many cases, it is preventable.
And you are right, many other conditions may resemble heart problems, for example, anxiety and stomach disorders. Let your doctor make those decisions about those, however, if you feel the doctor isn't meeting your needs communicate that to him or her. The best doctor's listen to their patients. I find most patients are unhappy if they don't get to fully express their thoughts on a problem. It sounds like you have been very thorough.