Thank you for asking HCM
I have gone through your query.Your problem is most likely costochondritis
.But it is better to rule out other conditions of heart and lungs by doing an ECG and Chest X ray
to be on safe side.For costochondritis i treat my patients with anti inflammatory gels like diclofenac
or nimusulide for local application.I also give oral tablet of same for some patients.Hope this may help you.
Let me know if you have any further query.