Hi, AAAA....... in my opinion you are suffering from allergy
For allergy , steroid nasal spray
with antihistamines are thd main line of treatment , which you are already taking ........continue them..
If it doesn't control then steroid tablets or injection are given. Along with other drugs like monteluekast.
I would recommend you to meet an allergologist and get allergy test done to detect the allergen and take allergy shots. This is called immunotherapy
which is the permanent line if treatment.