Hello Well come to health care magic Dear patient, let me tell you one thing clearly that allergic disorders like asthama and chronic allergic sinusitis have no permenant cure, these occur in episodic attacks which need to be treated with antiallergic medicines to cut short the attack, treatement could be through prevention of the attack if the triggerer of the allergic episode is found and by avoiding the exposure to that triggerer like a particular perfume, pollen , dust, mites, smoke etc but this is generally not possible to trace out the triggerer , however some immunologists do the allergic profile testing in an attempt to find out the triggerer and help the patients to avoid the exposure to them. currently your allergic sinusitis seems to have got secondarly infected as you are having lot of pain in the sinuses along with purulent nasal discharge on blowing, so you can consult an ENT doctor who after examining and testing you will give you some antibiotic medicines to cure the secondary infection WISH YOU RECOVERY SOON thanks Dr Arshad