What Can I Do To Help My Child With Ongoing Nausea, Vomiting, Diarrhea, And Constipation?

Since the end of February, my 9 year old is nauseous every time she eats and drinks. She has been in the ER twice and they refer us to a GI specialist who is booked till fall. She has not been in school for 12 days due to vomiting, nausea, diarrea and constipation. There is alot of mental stress and anxiety as well. We have gone gluten free since march 1st but her symptoms continue. Gluten has been a trigger for the past year. I m looking for guidance to get her to feeling better.