Any advise?

Hi all So my son is coming up to 3 and his always had like bad poos, mucousy and never really solid. He also has a rash that sometimes can't be seen on his arms and legs then it flares. He also gets a bit wheezy and we have taken him doctors countless times and no answers. Recently he had a stool sample done and it come back with a high protein inflammatory. His having another one done but I've also found out his granddad just been diagnosed with celiac disease and the same protein in my sons stool can be found in celiac sufferers Does this sound similar to anyone's experience please? I'm desperately trying to help him as it's not normal but haven't really got support from anyone even my husband as his one of them that needs evidence before committing to something