Considering turbinate reduction for better nasal breathing

[condition]

I had septoplasty and turbinate reduction surgery.  I also take Singulair (Montelukast) and Azelastine spray for allergic rhinitis.  This combination has helped me breath much better, decrease congestion significantly, and more easier tolerate my ventilator.  

May I ask if you were using these medications before starting CPAP therapy?

Because I was using Singulair and antihistamines very frequently before CPAP. I thought that I won't need these meds anymore, but falling to sleep with mild nasal congestion, creates pressure to my Eustachian tube, mainly on left ear that is flat on the pillow. I visited ENT doc, who prescribed more or less the same meds again. An allergist is also prescribing me relevant meds twice a year or so.

I believe that the air pressure as I am falling asleep pushes any mucus to my Eustachian tube. I wanted to discontinue Singulair as it was giving me strange dreams. It works well to dry the mucus though.