I have been having GERD and Acidity since last year. But the pain in always in my left breast and in the corresponding point in my back, sometimes spreading to my underarms and left arms. I'm super tired, I feel dizzy, I can't exercise for long (walking is fine). The pain in my breast feels like a combination of pricking, stabbing, itching, muscle cramp and burning. My calf muscles and arms feel energy drained. I'm also short of breath even when I'm not exerting myself and always in a bad mood, with zero motivation and lots of anxiety. I was asked to go to a cardiologist who said that I had pericarditis and was prescribed medicines for it, I got better in terms of only that, but the pain remains. I have Vit B12 and D deficiency, 101.8 LDL Cholesterol. All other reports are normal. I'm skinny, with PCOS and no thyroid. What is happening to me? I've tried different medicines nothing works!