The nightshade family of veggies can cause intolerances in some people. Tomatoes, potatoes, peppers.

Also some foods release histamine:
This can cause redness and tingling, often mistaken for PN.

http://www.michiganallergy.com/food_and_histamine.shtml

For example I get foot symptoms from highly concentrated tomato sauces. Some don't bother me like Bertolli. But Ragu is a big offender.
Sometimes a little bit of a histamine food is okay, but additive amounts will cross some threshold and give symptoms.
Some food intolerances don't show up for a day or two or longer, so take that into consideration.

Some food intolerances can be blocked with H2 antagonist drugs along with a antihistamine.
H2= Zantac (ranitidine), Pepcid, Tagamet (but not proton pump inhibitors like Prilosec).

Antihistamines like Zyrtec and Benadryl are better than Claritin (which I think is useless)

The gluten thing cannot be blocked by drugs, as it is an autoimmune response and is best dealt with by avoidance of the offending gluten peptide.