same here. seems to be a rare condition.
what can one do. inform your g.p. and apothecary.
alternative medication:
eye-drops and nasal sprays with sodium cromaglicate.
sterods (low dosage, generally free of side effects) stops breathing problems.
worst case: adrenaline and epinefrine (the latter due to some peoples bad drug habits allmost impossible to come by, even in a precursor supplementary form)
could try vit. c natural histamin
hypo-sensitivation therapy to the histamine-mastcell producing allergy.
avoid:prilosec, zantac, pepcid, benadryl, genahist, sominex, unisom a.s.o. that contain any form of anti-histamine. also often included in common cold over the counter medicine.
you could end up dying. wear a bracelet or bring someone if you end up in the hospital.