At first presentation one could guess it as IHD ( Ischaemic Heart Disease) but then pain is there for an year, no aggravation. I would advise you to start deep breathing exercises and start getting Cap Arjuna for controlling heart beats and restoring normal supplies to heart muscles. Liquid Arjunarishta should alsi be added. These are safe, no side effects, no interaction with other drugs. Anxiety issues will also be cared with these. Ideally an ECG should be done for assessment. For local pain issues pl. use application of local muscle relaxant like Rumalya liniment over chest and shoulder area. Pl contact again for further advise after ECG etc. But above med may be started as of now. Pl make sure to follow doctor s advise. You should have done cold patches too at that time. Hope its helpful.