Remember that I mentioned he should be checked for celiac disease?
http://www.celiac.com/st_prod.html?p_prodid=1170&p_catid=82&sid=91hH9H1jk2dc3GX-13107278578.95
Well, celiac disease can also sometimes cause mental illness - either direcly through effects of celiac disease, or indirectly through vitamin B12 deficiency which can be a consequence of celiac disease.

Can you insist that the GI doc test him for the following:
antigliadin IgG
antigliadin IgG
anti-ttg
anti-emsa
total IgA
serum B12
serum methylmalonic acid
thyroid tests


It's probably all his prescription drug abuse, but it would be a shame to miss if it was really gluten making him crazy.

Ellie