Hi welcome to Health care magic forum.
Thanks for calling H.C.M.Forum.
You have got pain in upper left abdomen. dark stools, some times blood in stools.
It appears that you have some infection in the intestines, most probably amoebic infection, or a combination of bacterial and amoebic infections.
There could be simultaneous gastric irritation due to irritant foods, or peptic ulcer
I advise you to consult a gastroenterologist
for diagnosis and treatment. you may need to use a combination of antibacterial and amoebicidal drug.
Wishing for a quick and complete recovery.