Well I have been dealing with bad sinusis for over 10 years.Its been rough.I know where you are at I have had 3 surgerys on my nose and sinuses.First surgery the said I had a deviated septum,had that fixed no luck either.Second surgery they did rf cobulation on sinuses.The 3rd one I just had about 3 months ago was complete sinus sugery.They did the following
turbinate reduction both sides
endoscopy w/maxillary antrostomy.
And removal of infected tissue.

I had constant sinus infection and facial pain,also get sick to my stomach,got so bad if I was off antibotics more than afew days got another sinus infection.Could never get past them.Well after the surgery I must say I am much better,not sick all the time,but I have had 2 infections since surgery.I think I must have tried almost erything out on the market never did to much for me.The things I found work best are affrin naasal spray,benadryll over the counter,and sinus irragation
all I can say is good luck to you I know the path to getting better isnt a fast one