Chest pain (Angina or GERD? ) Medicine.

Hi, I am male, 34 years, non smoker, vegitarian. In the last few weeks I took some antibiotics for viral infection. In the last one week, I am experiencing pressure in my chest while deep breathing, or while doing some yoga poses where chest is pressurised. In addition to the chest pressure, I am also experiencing chest pain, pain in muscles of arm, back pain, pain in stomatch below ribs. This pain is very mild and comes only for few seconds. The chest pain also comes when I sit in particular position, sleep in particular position and go when I straighten my body. Similarly chest pain is experienced when I jump, or when there is motion of chest like in aerobics activity. I am not experiencing any breathing problem, cough or sore throat, nor have any history of any similar disease. In addition, I am also experiencing bitter taste in my mouth, and very difficulty in swallowing food. I changed my eating habits by eating in more interval of time. Can someone please suggest some medicine.