As far as the burning smell, I have been able to make it go away by putting various home remedies
in my nose and using a neti pot. Now, sometimes I smell a sweet smell, like donuts, but I can make that go away, too, temporarily. So far, all my remedies are temporary, but I am thinking that with diligence, I will finally get rid of the problem.
I do the following routine with the nose drops at least once a day, and use the neti pot once a day.