Is my report with the terms there are a few short air-fluid levelsconsistent with a minimal gastroenteritis or mild localized ileus. is this something to worry about ?

Minimal gastroenteritis and mild localize ileus are both not serious diagnoses. Both can be treated by "resting" the intestines. To "rest" the intestines, only have fluids you can see through which are called clear fluids until all your symptoms are gone. Then gradually begin other foods with leaving meats, cheeses and other dairy products to be the last food to introduce to your diet.