Blocked nose and breathlessness. To do?

I do not breathe properly through my nose and nose is always heavy and closed. I have no problem like cough, sneeze, cold or sore throat. My 2 times operation of Deviated nasal septum and saptoplasty has also been done in 2012 and 2018.  But every time after a few days of opertaion the same chronic condition occurs.  My nose is always closed and I do not get breath properly due to which I feel suffocated and batchy and it is not clear from my eyes due to this reason, because of which I do not even drive.  All my life has been suffering from this problem and I can not tell you how sad I am. Is there any permanent solution to this problem or not.  What is the reason for this problem? Which treatment should I take so that I can get rid of breathing problem through my nose for a lifetime. I also smoke up to 6 cigarettes a day.  Guide me to solve this problem of mine. Please I am very sad and I have had this problem for almost 8 years. 8 years ago I was absolutely fine. what to do??