Heavy Chest. Please give some advice.

I got left back pain this march and that cause heavy chest and breathlessness. I visited a doctor here in MS Ramaya College Hospital and did X-Ray and ECG. He said everything is normal. Gave me some pain killer and pain relief ointment. But It didn't helped. I went to my native (Guwahati) and visited another doctor and showed him the earlier reports. He said do CT-Scan and Some blood test. I did and he said every thing looks fine. And gave me some calcium tablet Hydrochloride tablets . I also used heading pad on my back. The back pain reduced but a stiffness is there. But my heavy chest is there and I feel pain in my ribs. Both said muscle strain. But whatever it is I need a fix. Please give some advice. Thank You