Yes, my apologies. I forgot to address your original question!
I can't be 100 percent certain, but this sounds like similar pains I have had. I get dull aches in my chest alllll the time. Sometimes I'm able to shrug them off, but if I'm feeling anxious, I always think it's a heart problem. I have had them constantly for weeks at a time before. I still sometimes think it is my heart, but there's no way I could have had this much discomfort for this long with nothing else happening.
If you've had the tests, and they've come out clear, all signs point to you being ok. Hard to accept that, I know, but that's part of the struggle we are all fighting.