Katie -
The gluten clearance time for grain eating animals like beef and pigs can be as much as 6 months.

For eggs and poultry most eat a constant diet of grains - mostly corn.

Keep in mind that the offending protein in wheat is gluten, and gluten is a component in many different seeds like corn, barley, oats and rice.

The reason CD patients can react to all these grains is that gluten is only partly digested into its component amino acids and that undigested amino acid cluster can trigger the immune reaction. The unusual amino acid reaction can occur to bundles as small as 15-20 - much smaller than the normal absorbed amino acid chains of 100+.

Basically, you can go in circles trying to connect the dots of a differing symptomologies, until you eliminate the multiple sources of gluten.

PS - Avoid any product that claims it is gluten free, when in fact the only gluten source that it does not contain is wheat!