Chest pain for 7 months. For chest pain?

Hello sir... I had chest pain for the last 7 months , Before lockdown I had daily exercise in the gym, but during covid time my exercise was completely closed. After covid i m going to the gym and taking weight as usual but after 3 months I feel chest pain.. I visited the MD physician doctor and he took my XRay and ECG and told me all the reports are normal , he told me that u have muscle pain... Done 2 d echo, lipid profile, thyroid test, CBC and vitamin D all reports are normal ... But i feel chest pain, sometimes on the left side and sometimes on the right side... Pain is just like mild pain... I walk daily in the morning for 30 min and in the evening for 50 min .. But yesterday when I was running ( after running for 30 min) I felt mild pain in the right side chest ... If I have no heart issue then why do I feel pain ... 7 months of chest pain happens... What should I do? I was uploading my ECG and echo report which should be done in the April month... Reason for chest pain?