Hope they get you cleared up this time.
I had the sinus irritation deal fo rmonths also. Finally found an old horse doctor who was willing to prescribe an antibiotic that cleared it up.

The other docs were talking about drilling holes in the skull right below the eyebrows and scratching around to cause scar tissue. They said the scar tissue wouldn't allow the nerves to be exposed! I'd still be prone to infections... I just wouldn't feel it! What a bunch of quacks!