Chances are that these symptoms are link to immune reaction. Which? I don't know. According what you've told me, chances are big that candida antibodies are behind this. Can you associate these symptoms with some particular exposures. If not, chances are big allergy/sensitivity come from within you (candida antibodies reaction to all sorts of antigens). The sneezing is pretty frequent with yeast or mold sensitivites triggered by candida antigens. You still must be check for Iga allergy with a conventional allergist(prick/scratch test). It can be dust mites or mold conventionnal allergy. You have to rule out IGA allergy first. If all come up negative then I am almost certain this is caused by candida antibodies