Hello. Well, awesome that you are out there exercising again! Remember though, you have to ease back into it. Don't go too hard too fast. It's easy to do this if you used to exercise because we have muscle memory. But we can hurt ourselves this way so write out a plan of slowly rebuilding stamina and strength.
So, two weeks ago you had a check up for your heart. Also awesome. Smart to do that before beginning an exercise program.
So, I understand why you are concerned. I would call your doctor and report this symptom. Stable angina causes something similar to what you describe. Exertion causes chest pain, squeezing, burning feelings. But yours is not going away. Now, we can hyper focus on things and start to feel all sorts of pain. This is a real thing that happens. But I would want to report the exercise induced chest pain. I do know that I can occasionally get this feeling in my chest when I'm really pushing above my level.
Things like your cholesterol normal? Your blood pressure? I think I'd follow up with the doctor. Exercise is the ticket to a healthy heart for most people but you want to work it out safely. :>) Check in with your doctor on this.