Yes, it could be wheat. It can be very damaging to the intestines and the sinuses, as I've found out too. I also get really tired. I've cut out all but the slightest amount of wheat, and it's made a big difference. The cookbook mentioned in the following link may be of interest to you. GOOD LUCK.

pcrm.safeshopper.com/11/102.htm?53 - 8k

If you are having all those problems, I would suspect you're consuming refined foods. Refined grains (e.g. pasta), refined sugars (e.g. sweeteners in soymilk, fiberless juice), and dairy could all be to blame.

If you aren't already doing so, try only eating whole plant foods: vegetables, fruits, whole grains (especially brown rice), seeds and nuts. This is a very basic diet that is often life-changing.

read Foods That Fight Pain by Neal Barnard, M.D.
This book includes a lot of information on foods that trigger symptoms like migraines, allergies, Arthritis flares, etc.