Tummy problems

Amber
So I have a 4 year old. Over the last week she has had stomach problems such as pain, nausea. (No fever, and pottying normal) Took her in and seen her primary dr. He gave us heartburn medication. Friday the symptoms became worse and by midnight Saturday morning she was waking up every 20-45 minutes crying and now vomiting with a low grade fever 99.1. Took her to the er checked for uti (notmal), did x-Rays to see about consipation found out she is not consipated this is at 4 am this morning. They gave us nausea mediciation and told me
give her tylenol and ibprophen for pain and said possible
Stomach infection but wasn't sure what's wrong. Every symptom she has  is a symptom of appendicitis except a hard belly. Should I take he to another clinic, or er for another check up or just keep giving her medication to cover up the pain as if it's not a problem.  It's now 11:30 and she slept from 7-8 and 830 910 and been up since. And her tummy still hurts. I'm confused!