Thanks fro your query.
is causing blocked nose for you along with sinusitis
and this sinusitis is causing headache.
Therefore DNS is to be corrected to get rid of your symptoms.
Correction of DNS when it is symptomatic can only be done by surgery. There is no other alternative for it. Dont worry this a minor surgery and recently many endoscopic surgery
is also available for DNS correction.
As there is no alternative for DNS correction other than surgery and you are symptomatic its better to go for early surgery. Consult your ENT surgeon on this issue.