Hi,
Welcome to Health care magic,
Presence of 
low grade fever,vomiting and stomach or 
abdominal pain could be associated with 
acute gastritis or 
acute appendicitis or 
acute cholecystitis.Also these symptoms are not normal and require immediate medical attention.
So,all these must be ruled out first, but I will need more information from your symptoms of stomach pain like,
Since the pain was started?How was the pain and is it radiating to somewhere?
Do you have loss of appetite or burning urination?
After all this questions answered,a doctor will order some routine blood works,ESR,electrolytes,liver function tests,urine and abdominal ultrasound to detect the underlying cause.
Also,Diagnosis can be made by good clinical examination of by the doctor. 
I would suggest you to consult your surgeon or visit ER as this symptoms are not normal and immediate medical attention is required for further assessment.
Meanwhile,you can take antispasmodics and anti-emetics with anti-pyretics and antacids for symptomatic relief but as i said you will require immediate medical intervention.
Regards,