Pain on the left side of chest.

I am having pain on my left side of chest since more than 20 days. The pain is sometimes near the heart, sometimes over the shoulder, sometime on the throat. However, the pain is constant. I have consulted General Physcian for the same. He advised to do the following tests: 1. CBC 2. X-RAY 3. ECG The results for all the tests were fine. He prescribed me the below medicines for 3 days 1. Nexpro 20 2. Mysopaz Forte The pain was reduced for those 3 days, then on the next follow up, he prescribed me the below medicines for 3 more days: 1. Nexpro 40 2. Brufen 400 3. Chymoral Forte The pain was almost gone while taking the medicines but now when the medicines are over, the pain has come back and it's the same pain as it was before the consultation.