welcome to HCM
i had gone through your query and understand your concerns. i would come up with the possibility of ACID PEPSIC DYSPEPSIA
may be the cause for your sufferings.
possible causes include;
behavioral factors; stress
local factors; h.pylori infection,gastritis
,irregular diet,eating junk food,sedentary lifestyle etc.
there is another possibility like DIVERTICULITIS;inflammation of balloon-like protuberance due to excess Gas pressure in intestines.often caused by additives in food,or low blood sugar
x-ray with barium enema
may confirm the diagnosis.
I hope this is helpful for you, thank you