Anyone ever experience heart / chest pain after cycling?

Thought I would reach out to my fellow slowtwitchers regarding this. I’m 29 years old. Male. Have been doing triathlons for about a year and have no history of heart problems. Am generally healthy. A week ago today I began feeling a dull ache in my chest. It’s not really painful, but rather dull and seems to radiate from just off the left center of my upper chest (just to the left of my heart). I began experiencing the discomfort after a 90min moderately difficult session on an indoor trainer. Has anyone ever experienced heart or chest pain after cycling?

It’s been a full week since the ache began and it still persists. I actually went to a cardiologist three days ago and completed a cardio eco-gram / stress test, but the results were normal and the cardiologist couldn’t really offer any constructive advice.

What should I do in this situation? I’ve essentially haulted my training…have only done about 2 hours of very easy aerobic cycling on the trainer (so as to avoid going crazy). Have completely stopped running and swimming. Any recommendations?

Thanks in advance for your thoughts.