You seem to have a chronic (long standing) Nasal Obstruction
with moderate to severe Allergic consequences.
There are possibilities of Mechanical obstruction and Polypoid changes in your nose and paranasal Sinus
You need to consult your nearby ENT Surgeon for local (ENT) examination, you may also require X-ray PNS and / or CT Scan
PNS to confirm the clinical diagnosis, and then the treatment can be planned.
spray is not advisable for long term usage.
If you are in Bangalore, you can consult me with prior appointment.