The toxins caused by parasites make the immune system work 24/7 to try to deal with them.
When the liver is overloaded with toxins - the body will recognize certain foods as "toxic" - therefore causing food allergies.
I have seen that people who suddenly develop food allergies later in life are able to get rid of these same allergies after they rid their bodies of parasites and toxins.
When the liver is healthy and functioning like it should - then the food allergies (and lots of other problems) seem to go away.
I do not know much about the type of allergy treatment you speak of - but if it is not herbal based - then it should go along fine with HUMAWORM.