I'm betting your anxiety is being caused by TRP channels lining the nose/sinus and digestive tract being activated. TRP channels located on mast cells will also trigger mast cell degranulation. My immunologist collaborated on the NCNED TRP channel gene study earlier in the year. The TRP channels become more easily activated in the presence of inflammation, most likely because of lowered glutathione levels:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2735846/
Unfortunately I've not had much success with mast cell stabilisers for getting things under control so I'm still in a pretty horrible state. Likewise I don't tolerate any of the supplements in the original post :-(
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2735846/
Once glutathione is depleted, either as a consequence of disease or during extended exposures, TRPA1 may respond much more strongly.
I use a mast cell stabiliser nasal spray that doubles as a TRP channel blocker. It seems to only help if I don't overuse it, but when it works, it can instantly decrease my anxiety / over-stimulation / sensory overload. The effect doesn't last though.
Unfortunately I've not had much success with mast cell stabilisers for getting things under control so I'm still in a pretty horrible state. Likewise I don't tolerate any of the supplements in the original post :-(