Mystery

We have had a mystery on hour hands for several months now. The mystery resides in Ainsley. Most likely in her stomach.

Here are the facts:
It started around the beginning of the summer. She would complain about her stomach hurting. A lot. We mostly disregarded her.

In an attempt to ease my conscience I took her to the doctor in August.

Blood and urine were tested.

She was tested for a UTI, Celiac, and a myriad of other illnesses and diseases.

All tests came back negative.

I thought it might be constipation. We gave her mirilax.

Slowly her stomach aches went away.

Then suddenly about a month ago she started throwing up about once a week. She'd wake up in the early morning with a stomach ache and throw up until her stomach was empty and then she'd keep going, just throwing up bile.

This has happened every week for the last 4 weeks. Ironically 2 were on a Sundays. And then yesterday she complained that her stomach hurt again and John ended up bringing her home from church. She was fine all evening. Woke up sick. And threw up all of this morning.
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I'm not sure what to do! We just had to switch to a new doctor and I'm not sure that I trust her completely yet. (We had some issues with our last round of testing and about fainted when we got a bill for $900 for the lab work that she said was basic and inexpensive.)

I don't know if anything is even actually wrong with Ainsley or what the medical field will do for her. So far there seems to be a big question mark above all doctors heads....not to comforting.

I wonder if it's something she'll grow out of.

Would someone care to solve our mystery or tell me what to do?!?!?!?