Hi,
Welcome to health care magic,
I have read your whole history and understand the concern.
Diverticuloum is a abnormal outward projection of mucosa of colon.
When it is get infected,it is known as
diverticulitis.You might have repeated infection of this leading to
stomach cramps or dark brown
diarrhea etc.
You should take complete course of antibiotics ( quinolones or cephalosporins) with antiprotozoals like
metronidazole with some symptomatic drugs like antiemetics,antispasmodics, probiotics and other supportive treatment with dietary restrictions to low fat and high protein.
But the main cure will be surgical removal of diverticulam because of repeated gut infection or they could be also chances of complications like
peritonitis or acute bowel obstruction etc.
So,better you see gastrosurgeon who will examine you thoroughly with some relevant test and can start some definitive treatment.
Regards,