Thanks for writing to H.C.M. for your query.
I have gone through your query regarding headache after septal and sinus surgery
, this headache is usually felt after exposure to either execive cold
or hot air. You are feeling as your nose is quite widened after surgery.
Considering your problem it appears as your nasal turbinates are either gets atrophied after surgery or being excised in operation may be they are be involved in disease process. It might be also possible that you may now developed atrophic rhinitis
All above possibilities are to be clarified by thorough examination and relevent investigations to take proper action for treatment.