No answers here either sorry. Is it possible to see another paeadiatrician? You deserve to be heard.
Abdo pains and cramps would make me think more of constipation or colic. Don't get be wrong, I'm not saying she doesn't have reflux. These conditions tend to stick together along with allergies. Constipation isn't technically the description, and better descriptions are decreased gut motility, difficult evacuation of faeces etc. Have you tried a probiotic? These are good at promoting good gut motility and replenishing the good bugs that Losec can let be overgrown by bad bugs.
Allergy testing often doesn't pick up the gut reactions as they aren't IgE mediated. A delayed patch test may help more but I don't know if they are that readily available. An endoscopy is usually done if reflux doesn't resolve by a certain age, or is difficult to control. Is her pain mostly controlled now?
Zyrtec is an antihistamine.
http://www.everybody.co.nz/otcguide-product-171.aspxBest wishes