Now a days chronic allergy is common issue many people suffer from it. And the problem is managable with certain precausion.keep track on your activity and identify those culprit( you can also go for allergen test to identify allergen) which creats problem then avoid that activity or perticular thing which is reaponcible for allergy.this will help you a lot. Other thing that you should do is yoga( like anulombvilom and kapalbhati) which help to improve body immunity and hence will benifit you.there are certain regime which block the allergen by using specific antibody and are very effective. You said that you use regular nasal spray but forgot to specify type of nasal spray but i would suggest not to use it on daily basis cause there are many side effects like rhinitis medicamentosa and it also worsen the condition once you discontinue the spray which again leads you use it agai (cycling process). So avoid apray as much as possible. Your history also suggest that you might suffering drom chronic sinusitis . For that you should go for x ray, ct scan or mri head to confirm it . If it is chronic sinuaitis then it can be treated by medicatin like antibiotics , anti histamonics and NSAIDs if it ao sever that it does not reapond to above treatment then surgery can be done sucssesfully..i hope this information will help to proper treatment.