Eliminating wheat is a good idea, but you really need a solid 3 weeks gluten free (look for wheat in many foods, not just bread!) before you can really say whether this is an issue for you.
You might also try a sinus saline wash - this will really help unstuff your head. In the US you can get this at any pharmacy. Not sure about France. It might also be called a neti pot.
50 yrs old, IBD diagnosis in spring '01. Proctitis, gastritis, ileitis.
Pentasa (3g/day)generic Colazal ( 96 pills/day), Sulfazine (1.5 g/day), Prevacid, folic acid, vit. D (2K iu), flax seed oil (2 tsp/day), psyllium (1/2T daily), mesalamine enema as needed. Gluten free as of 5/30/11. Colonoscopy found no evidence of inflammation on 8/16/1