If you have celiac disease, have gone gluten free and still feel sick I think you should try putting yourself on the GAPS diet or SCD diet. It is temporary and helps heal the gut. The leaky gut syndrome is caused by the food leaking out of the holes in your intestines (caused by celiac spur) and going into your blood supply. You may have these holes. I am not sure, but this may be worth a shot and it is all natural approach without pills. Sounds great to me.
GAPS
SCD (Specific Carbohydrate Diet)
http://scdlifestyle.com/2012/ 01/the-celiac-disease- epidemic-why-gluten-free-isnt- enough/ (this guys story of suffering with celiac's is very interesting)