Hi thanks for your question.
Your both nostril frequently remain blocked and your using nasiovion for blocked nostril
There could be two reasons for your blocked nose.
No 1 Devated nasal symptom commonly called as DNS
and No 2 Allergic rhinits.
Long term use of nasivion
does cause atrophy
of nasal mucosa.
Get your self examined by some physicion for DNS.
DNS if present can be corrected surgically.Hope I answered your question.