If it was me I would start with gluten containing products that aren't straight wheat. Products that have small amounts of gluten could help test your reaction. I am only giving my opinion because I know you will not hold me to any responsibility and besides you don't feel good now as it is.
-------------------- IBS-A for 20 years with terrible bloating and gas. On the diet since April 2004. Remember this from Heather's information pages:
"You absolutely must eat insoluble fiber foods, and as much as safely possible, but within the IBS dietary guidelines. Treat insoluble fiber foods with suitable caution, and you'll be able to enjoy a wide variety of them, in very healthy quantities, without problem." Please eat IF foods!