Welcome in H.C.M. for your query.
I read your query and came to a conclusion that you are a chronic patient of allergic rhinitis
as you are already taking anti allergic treatment but still you are having difficulty in breathing.
Most probably you are having HYPERTROPHIED inferior turbinates, and this has given much obstruction in air passage. This will be confirmed by C.T.Scan paranasal sinuses
If clinically and radiologicaly this hypertrophy is detected than you may consult your ENT doctor for-
(a) Coblation assisted turbinate reduction.
(b) Turbinoplasty by laser
(c) Submucous injection of Hydrocortisone
intranasal over inferior turbinate.
I hope this will help you.