What Causes Recurring Chest Pain In A 51 Year Old Person?

I m 51 years old, in good physical condition, hiking many miles per week (however, under extreme stress lately). Off and on, I ve been having chest pains. My father and his mother have heart history, neither had heart attacks, but both had stents. I have an annual check up every year and always have perfect blood work. I m concerned I might have a blockage. I m experiencing shortness of breath, fatigue, and occasional pains in my left chest. It s sort of a dull tightening feeling, not a sharp pain. My question...is there a quick test I could get at a clinic that could tell me if this is a heart issue or a stress issue? I m traveling in my RV (have been since February) and have plans to continue through October.