Hi - I feel a fullness in my upper abdomen area (near my rib cage). It doesn t seem to bother me when I m laying down, but when I stand up, I get burpy . When I exert myself with exercise, it really bothers me, like there s food that s not going down. I ve had these symptoms for quite a while. Last Octobe, I was diagnosed with pericarditis, which was causing my heart to go into an arrhythmia. This feels somewhat similar, except I haven t had any irregularities in my heart beat. Any Ideas what might be causing this?