deviated nasal septum is not a uncommon entity and most of us will have some kind of deviated septum and infact straight septums are exceptions. your history is very much suggestive of allergic rhinitis with allergic Lower airway disease. allergy has no correlation with deviated septum and correction septal deviation is unlikely give you any benefits since you are responding to ventidox M you can continue with same medicines or add steroid nasal spray /inhaler depending on the severity of the condition also try doing physical exercises, breathing exercises, yoga which can sometimes help to overcome symotoms

You need to get a CT-scan done of your nose & paranasal sinuses. This will reveal whether the nasal septal deviation is the significant cause of your problems or whether there are other factors also present which are contributing to your suffering. Drop into my clinic for a detailed ENT examination so that we can solve this issue once & for all.