First, my heart goes out to you and your daughter. I understand the frustration, embarrassment, anxiety and distress that you are experiencing. I have the same thing and am no expert, but maybe I can tell you what has worked for me and you may see something that can help your daughter. For GERD, I purchased a 7" high foam wedge from Amazon for sleeping and this has really helped stopped acid, food, etc. from traveling back through my esophagus into my throat. I eat early and less in the evening. I began eating a Mediterranean diet, began walking, and lost weight. This was very hard for me. 🙄 I also saw a dietitian and she gave me a list of foods to avoid to help with GERD and I am fairly serious about not having spicy food, processed foods, caffeine, chocolate, etc. The list is long, but there are many foods that aren't acidic. It has really helped!

IBS is a nightmare. I can't seem to get a handle on what is causing it. I'm about to try FODMAP. Google it. It's a food elimination system to see what's triggering the constipation, diarrhea, bloating, etc. I hope something here helps.