my son is severely allergic to dustmites, can wake up in the morning with swollen lip and tingly throat, and hives.
there are many, many 2nd generation antihistamines to try, any hyper behaviour can be the artifical dyes etc in the syrup.
but do try others.
other normal things to do in home.
dustmite covers on bed.
damp dusting bedroom.
all books, toys etc in plastic , lidded boxes.
teddies frozen over night, then washed at 40 will kill the bedmites.
no hanging washing on radiators to dry.
no hanging clothes outside if other environmental allergies suspected, esp bedding.
also, windows only opened midday, never morning or evening. due to higher levels of pollen.
cool baths at night. never warm nightware on radiator before wearing.
boil wash towels, and never put in airing cupboard, or leave with other towels that have not been boiled washed. otherwise you are rubbing dust mites in to skin after bath. we have had a good crop of hives doing that.
good hepra vacum , avoid if possible use with child in room.
boil wash bedding.
leather furniture, wooden flooring.
dustmite allergy is a very expensive allergy, and we melted our credit card ........
our home has two carpets the front room, and stairs.
leather sofas, wooden flooring, and his whole room changed to cope with this allergy. and is does help.