Hi,
Welcome to health care magic,
Diverticuloum is a abnormal outward projection of mucosa of the colon.
When it is get infected,it is known as
diverticulitis.
You might have infection of this diverticulum leading to stomach pain,nausea, vomiting and fatigue or occasional
constipation etc.
You may require antibiotics ( quinolones or cephalosporins) with antiprotozoals like
metronidazole,anti-emetics,antispasmodics, probiotics and other supportive treatment.
Your family physician will know about it and may prescribe you the antibiotics.
You can go for routine blood works and upper GI endoscopy as you have done
ultrasound of abdomen which was come normal.
Also, you have to be careful regarding dietary restrictions which should be low fat and high protein.
But the main cure is the only surgical removal of diverticulam because of repeated gut infection or they could be also chances of complications like
peritonitis,bowel obstruction etc.
So,better you see gastrosurgeon and take advise.
Regards,