Hi dear,
It will be better to discuss with a gastroenterologist.
Abdominal pain have different etiology. You have to give us some more details to differentiate them.
Your pain is from upper mid section means it is related to lower esophagus,stomach,parts of
small intestine,pancreas,
transverse colon,
abdominal aorta.
Burning sensation indicates it has some relation to stomach and esophagus.
Nausea and vomiting ; projectile vomiting from obstruction or toxicity.
Others may be appendicitis, pancreatitis ,hepatitis.
If you are vomiting soon after food intake it may be from gastric ulcer or upper gastro
intestinal obstruction.
You had just mentioned that you have no diarrhoea,but is there a satisfactory bowel? If not indicates chances of obstruction.
Fever suggests infection. These all are the possibilities. Hence there are several factors to consider before final diagnosis I suggest to discuss with an gastroenterologist if symptoms persist. In my opinion your symptoms may be from gastric ulcer or appendicitis as it is epigastric, increase with eating or drinking, nausea, vomiting and small temperature.
With thanks, take care