I can tell you waht helped me. This is, in my opinion, a yeast issue, at least for me.

Get Donna Eden's book "Energy Medicine". It very much has to do with the immune system being overactive. Specifically do the 5 minute daily routine plus the accupressure points for sedating triple warmer meridian and strenghtening the spleen meridian. I noticed a differenec after 2 weeks. I only have slight sensitivies now. Also try the other exercises if you have time.

Other helpful stuff:
Avoid chemicals of all kinds, including cleaning and personal care products. There are better natural alternatives.
Avoid chemical additives, sugar, artificial sweeteners, and grains (carbs), and processed foods. Make all food from scratch with pure organic ingredients. Read labels carefully, some organic foods have msg listed under many aliases.
Follow food combining rules.
Take oil of oregano. Go slowly to minimize die-off side effects.
Same for probiotics.
Exercise to tolerance. It should make you feel good afterward.
Avoid stress, do yoga or meditation. Get plenty of rest and keep a consistent schedule.
Learn EFT, free manual at
http://www.emofree.com

hi, maybe you could look into Bioset. they are about removing food allergies , and claim to have success. they are based in marin, ca., but i think they have branched out, so there may be a practitioner near you.

maybe check out the Candida Support Forum and Rotation-Elimination Diet .

eliminating offending foods from the diet and giving the body rest time to cure the sensitivities is probably the best bet

wheat, gluten, dairy, corn, peanuts, tree nuts, vinegar, citric acid (industrially created with aspergillis niger -fruit citric acid is ok), sugar

these are very common triggers. if he eats any offending foods/chemicals at all, a reaction will likely happen and its very disheartening

trying out foods, rotatating, and eliminating is the best bet to figure out what personal intolerances are.

from there hopefully something like the makers diet will help..i am going to start it to see if it will help with my similar problems (candida, EBV mono, food sensitivities , IBS)

good luck