Hello and hope you are doing well.
You can develop tolerance to anti histamines. So, instead of using them continuously, you can take them intermittently or keep changing the antihistamines. You can try immunotherapy for dust mites. For the dog allergy, you can try certain preventive measures to reduce the episodes of allergic rash. Try restricting the dogs access to certain areas of the household and use of air filters and with frequent and proper housecleaning, and furnishings less likely to harbor allergens.
Hope this helped and do keep us posted.
P.S. if ur comment recomends my getting rid of the dog - forget it - its not going to happen - I would rather suffer the hives then take the chance that my sweet loving pitbull ends up with a bad owner. I wont betray her love in me - as she has decided I am her person and follows me everywhere I go. I have had Many pets in my life and could not imagine my life without "our furry lil friends" :). The pitbull Breed is the only type of dog that I am aware of that causes an alergic reaction in me.