Your symptoms may be due to appendicitis (obstruction of the narrow appendiceal lumen initiates the clinical illness of acute appendicitis and may be due to many causes, among which is diverticulitis, inflammatory bowel disease, colon tumor).
Abdominal pain and loss of appetite are the main symptoms.
Nausea, vomiting, diarrhea or constipation are additional ones.
Fever, may or may not be present.
It will be a good idea to get checked with abdominal CT or ultrasound since they can give better visualization.
There are many different conditions that can resemble the appendicitis symptoms.