I have had pain/pressure in my upper left chest area over my heart for two days. The right side of my abdomen is also very soar. (I have problems with IBS). Is this gas pain or something more serious? I am not sweating or have shortness of breath. I am not sick to my stomach either. But the pain radiates to my left shoulder and arm and my neck is a little soar (but on the right side), my heart fells like it s pounding and I ve been really tired. My bp isn t high, though I do have high cholesterol and family history of heart disease. I have taken 2 antacids but have gotten no relief. I have been under ALOT of stress lately and have not had much of an appetite. I don t want to go to the doctor unless I absolutely have to because I just went last week for a possible sinus infection. I was given amoxicillin (which I ve almost finished) and Nasonex to treat allergy symptoms. Besides the antacids, those are the only other medications I ve taken. Is this as bad as I think? I hope not.