Here we go again

Megan is 7 and just finished 1st grade.  She has been having "tummy troubles" since she was 4 - complaining of a tummy ache; sometimes nauseous and sometimes not.  When it first started, I talked to our pediatrician and he said he was only concerned when they acted like they weren't feeling well.  At the time, she would say it hurt, but act normal.  Then, it started getting worse, reaching a peak during her kindergarten year.  I actually had to go get her from school three times that year due to complaints of her stomach hurting.  In March 2011, she had just gotten over what appeared to be a stomach bug (except that nobody else in the house or her class got it - something that has happened a little too frequently to be coincidence in my opinion.)  That evening, she was complaining of her stomach hurting even though it had been 48 hours+ since she had vomited.  I sent her back to bed and she passed out.  I found her lying in the floor of her room semi-responsive.  After that, I determined to get some answers.  We visited her pediatrician again, but I wasn't satisfied.  After another bought of belly pain and an early pick up from school, I requested a referral to a GI doc.  We got the referral, waited 6 weeks for an appointment, and last summer, she had blood work, an abdominal ultrasound, and an upper GI x-ray.  Know what they found???  NOTHING!  They said everything looked normal and suggested that, perhaps, she was just constipated.

In the year since then, things have been much better.  Although she still seems rather susceptible to the stomach bug - she was the first to get it this winter and, after it went through the rest of us, she got it again - she has had very few episodes of tummy troubles.  Until this week.  She has had an "episode" three times in the past four days.  On Tuesday morning, she laid on our bed for an hour watching T.V. and complaining that she felt like she was about to throw up.  Again Thursday night, she said her tummy was hurting and she felt like she might throw up.  It lasted for about an hour, until I put all the kids to bed.  Today, she finished her horseback riding lesson complaining that she was "so hot her tummy hurt again." (It was 9:15 in the morning.)

Is she faking it??  Is she really just constipated??  Is it an allergy??  (Although after keeping several food diaries, I cannot find any sort of pattern to indicate a possible allergy.)  Do we go back for further testing??  (Only other option is endoscopy under anesthesia.)  These are all questions I ask myself every time she complains.  As the mommy, I am supposed to have all the answers.  In this case, I don't and, even though I have tried to get answers elsewhere, I have come up short.  I thought we were moving past it - that maybe she was outgrowing whatever it was.  This week, however, it feels like here we go again.  I don't know the answer and I don't know what else to do.  I do know that I get more frustrated every time and that this pitiful face is NOT my crazy, silly, energetic Megan. :-(