I am a 37 year old healthy female. For the past few weeks I have felt a fullness in my upper abdomen...at night it turns into chest discomfort - sort of a pressure pushing outward on my rib cage. My upper back also hurts all the time between my shoulder blades. I have slight scoliosis so I don't know if the back pain is related to that. I often feel like my heart is beating very hard and at night it feels like it is beating irregularly. I also have tenderness in my upper abdomen just below my ribcage. For the past few days I have had no appetite. When I eat, my stomach immediately starts to gurgle loudly. I have an excessive amount of air - constantly belching and passing gas. It doesn't have a foul odor, though. I don't have heartburn. Also, my stools float. I've been trying to eat a fairly balanced diet. Can you tell me what this might be? I don't know whether it's cardiac or GI or both....or just in my head....I also worry about EBV flare up since I had a bad bout of mono four years ago with liver and spleen inflammation that I had to take prednisone for. Is that possible?