It is very common for symptoms to return after stopping your medication (levocetirizine and montelukast), as these helper medications manage symptoms rather than cure the underlying allergy. For safe, long-term control, you might consider daily corticosteroid nasal sprays (like fluticasone or mometasone), which target inflammation directly in the nose with minimal body-wide side effects. For a more permanent solution, allergen immunotherapy (allergy shots or sublingual drops) can gradually desensitize your immune system to your triggers. I highly recommend consulting an allergist to perform allergy testing and help you safely transition to a sustainable, long-term management plan.