Matthew, it could be a reaction to the oatmeal itself - the gluten-like moiety in the oats - or it could be the oats are contamined with 'wheat' in the fields, or the shipping or the storage problem. Try some oats from www.glutenfreeoats.com - I think that's the site. My husband can have oatmeal from that company with no problems and I make him cookies out of those oats all the time. It's worth a try.
Also remember that some with celiac cross-react to casein, the major protein in diary. Have you had that checked out?
Matthew, if the rice is fortified (vitamins added) there can be a reaction. The fortification process is accomplished using either a corn or gluten 'slurry.' My husband has experienced a reaction from fortified rice, unfortunately. We buy a 'sushi' rice - organic, non-fortified from Koda Farms. I believe all rice by law - except for sushi rice - has to be fortified. Try contacting Koda Farms and finding out where their sushi rice is sold.
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