GERD is gastroesphegeal Reflux Disease. Or, acid reflux constantly. So I agree with you that if she doesn't have that, the Pepcid isn't going to do anything.
I would ask your pediatrician for a recommendation to a good pediatric gastro doctor. That's where I found my first from.
I was diagnosed with my GERD when I was 12, and my IBS when I was 14. I'd always had problems with food and umm... digesting food though. My whole life that I can remember. I had serious problems with constipation when I was very small and they fed me a lot of mineral oil (yuck). Coincidentally I also became a vegetarian when I was 12 or so, which helped my IBS a lot because I wasn't eating red meat or a lot of dairy which is a no-no for people with IBS.
A lot of IBS-ers (me included) can't take having an empty stomach and need to eat every couple of hours or so. So that could be a sign of IBS.
You could buy her some soy ice cream... then she could eat a little bit whenever and not feel deprived!
As for the picture, you need somewhere to host it (a lot of people use photobucket.com), they'll give you instructions on how to upload it and then you put the URL in your homepage profile (on this site) and there you will be! Or you could email a photo to Heather and she'll put it up when she gets the chance. We're always happy to see the faces of people we talk to around here.
I'm glad to be able to help... I do understand what it feels like to be young, and my parents really had no idea (though lots of good intentions) on what to do.