Hello
As you mentioned that you are a patient of 
allergy and using 
ceterizine tablets for this purpose.
Since diagnosis is established so avoid certain predisposing factors causing allergy , these are :
Dust , mite , pollen ,hay , fodder , fine dusting powder, sudden fall and rise of temperature ( change in temperature ), mold ., pests ( cockroaches ) .
If possible avoid these factors.
When such type of patient visit my clinic I advise them to take Monteleukast+ 
fexofenadine combination according to need ( whenever require). 
Hot coffee and steam inhalation also provide relief . 
Hope this information will be helpful for you.