hi....I have a strange popping sensation in the upper abd/diaphragm area.  It does not hurt but feels strange and happens when I move a certain way like bending to shovel or rake...and sometimes for no known reason...after I eat I may feel it. It tends to feel better when I press down on the area with my hands...
This is gastritis or more chances of hiatus hernia as your history suggests you may need to diagnose it by endoscopy or barium swallow or ultrasound the exact picture can be diagnosed with this and this can be managed properly after diagnosis