Slight Chest Pain In Upper Right Chest Area Near My

Slight Chest Pain in Upper Right Chest area near my Man Boobs. I am laying on my back and nothing . when I breathe nothing but if I breathe deeply it hurts a little or if I move a lot it kinda hurts. I am fat (280-290lbs) exercised on a recumbent bike last night (did 4 miles on lowest resistance and just did 1 mile tonight). Maybe I pulled something. I am tired now (close to bedtime) and a little coughing but not bad. (Have not coughed in the last 3 minutes while I typed this). I might be considered a cyberchondriac. My breathing is as well as can be expected for a fat man. I take Zoloft. Could this be Anxiety or Depression or me being fat???