Hi, that's too bad that your daughter is going through all this too.
In my opinion it doesn't make sense to give acid blockers to somebody with slow digestion. How is that food gonna go anywhere if there's no acid to digest it?
I have similar problems along with a weak LES valve, and take fennel seeds whenever I feel that things are just sitting there and they help. You just take about a pinch and chew them, they taste a little weird but its worth it for me, along with digestive enzymes.
Plus the thought of limiting the nutrient absorption when you don't have acid to aid it is a scary thought especially with an 8 yr. old.
Maybe you should go with another dr. and get a second opinion.
Hope you both feel better.