I have constant chest pain lots of times like heartburn and I think my muscles get sore from working out but they never hurt while I run. However today after I finished an all out 1600 which I'm pleased with there was some discomfort a bit and my neck felt like it was gonna explode. I did a cool down mile and at the very beginning there was 2 sharp stabs and then no pain the entire run. Anything to worry about?