I also have had Chronic sinus
problems for too many years, & 3 lots of surgery, more recent;y the diagnosis is "Chronic sinus
Disease", which doesn't really mean that much other than regular check ups with an ENT specialist.
You say Doctor, is this an ENT specialist??, & if not, I suggest you insist on a referal to see one, as they are the ones that will have a better insight into whats going on with your sinus