Hi
I do know someone whose child was gluten intolerant and manifest with tics and other digestive illness as well as the headaches and vomiting

going GF has been a total turnaround and they now know that the child does not have TS but rather has celiac disease

so many other conditions can be misdx as TS when insufficient testing is done by docs who tend to see a tic and dx "tourette syndrome" forllowed by a rx of strong drugs

so glad you decided to check into diet yourself first

my son does have genetic TS but dietary modifications have dramatically helped him