Your protocol of medicines is fin
if you are having conol over your symptomps it is fine with this
you can continue as long as you like
but i will advise to go for allergytests and go for
sublingual immunotherapy which is latest and being recomended by european college of allergy
asthma and immunology as treatment of allergic asthma
it is helpful as i have reated many patients of dust and parthenium allergy like this