Left breast pain , heavyness ,

Facing a bit of discomfort in left part of the chest , slight pain is also there , pain sometimes occurs near the armpit to , although I was having severe upper back problem and that too on the same side ,so my therapist told me that it's due to muscle strain but it's been months ,the feeling is still the same ,I can feel a bit of tightness in front and back , I am not sure about any lump because I didn't find any or may be I don't know whether my examination is right or wrong , but whenever I walk ,bend ,study or sitting or doing  any kind of stuff ,I could feel the difference ,feels like it's continuous ,one of my family doctor in homeopathy had given me a simple chest pain controlling medicine ,with that for a particular of time the pain disappears but after that ,same situation ,what to do ??