You are suffering from persistent rhinosinusitis and allergies definitely need to be excluded with either skin prick tests or specific IgE blood test
Change of season worsening of symptoms would suggest either pollen or mold allergy
and if you have pets at home, that would make it worse if you have allergies to them or if they are bringing them inside from outdoors.
You have taken all antihistamins and nasal steroid
sprays are also required with antihistamine plus or minus asthma inhalers if you get shortness of breath
After finding out the allergens on testing, immunotherapy
over 3-5 years may seem the last option if optimal medication is insufficient to control the symptoms.