Hi thanks for asking question.
Here are few possibility in your case.
1.First you might have simple
gastroenteritis like infective condition or ulcer in intestine.Do your complete blood examination.If total count high with neutrophilia bacterial infection is the cause.
Ofloxacin and ornidazole combination antibiotic needed for it.
2.Second it could be simple functional bowl disease.
3.Third if vomiting and
abdominal pain increasing then
inflammatory bowel disease also though and endoscopy examination needed for it.
4.If associated fever is present then
diverticulitis like disease can be thought.
5.Fifth abdominal pain might be because of constipation.so treat it below.
For constipation take fibre rich food like whole grain,wheat bran,apple, spinach etc.
Drink more water.
Regular exercise done.
Digestive enzymes helpful.
Chamomile in tea found useful.
If still no benefit for constipation
stool softener can be taken.
Wish you good health.
Dr.parth