--go take a look at our celiac/gluten sensitivity forum:

http://neurotalk.psychcentral.com/forum13.html

--especially The Gluten File, with its material on how IgA deficiency is involved with gluten syndromes. A number of people there are very conversant with this type of immune situation. (And have you been tested for anti-glidain, anti-endomyseial, and anti-transglutaminase antibodies? What you've got going sounds so much like there could be a gluten problem. And it wouldn't have to be celiac--as one of our posters says, that's only one finger on the gluen sensitivity hand.)