What Are The Symptoms Of Potential Heart Disease?

Hi, last night my chest felt very heavy when I lay down. I wouldn t call it pain, it was more like something was was sitting on my chest. It got better when I sat up and better still when I stood up. I had asthma as a child that I more or less grew out of (if that s possible). I only have issues with it about 2x a year due to allergies. The sensation didn t feel like asthma, but maybe the symptoms change with age? I m 32. This sensation in my chest happened about a month ago and I saw a doctor. CMP, CBC, TSH all came back normal and H. Pylori test came back negative (I also get a gnawing pain in my stomach that comes and goes, but this doesn t happen during the chest episodes) . I m concerned this could be a heart problem. I think that thought is causing me to lose more sleep that the discomfort in my chest. The heaviness was gone when I woke up but it feels like it s coming back. Should I be in the ER now? Have my doctor do an ECG? I m a 32 y.o. female, BTW. Sorry for the lengthy query...