I don't know if you are interested in trying this, but there is an alternative medicine treatment out there that helps eliminate (or at least decrease) allergies. It is called NAET. You can find a practitioner at the link http://www.naet.com/. I don't believe in a cure-all or that there is a miracle treatment out there that works for everyone, but my son and in-laws have undergone this treatment with good results. My son had a really bad rash on his face that we could not get rid of; the doctor tried everything. Based on a bunch of research on my part I suspected it was a milk and chocolate allergy. the practitioner treated him for milk and I could watch it clear up within hours after the treatment. It did come back after a few days, but it was not nearly so bad. I later had him treated for chocolate and grains (including corn) and it is much better. He still has a very mild version of the rash, but the improvement is incredible.
Just so you know, it is a quick, painless, noninvasive, relatively inexpensive procedure.