Canker sores,coated tongue and a sore throat, after sinus surgery, how can this be?

I had sinus surgery on July 2,2007. One week later I had a coated tounge,sore throat and one to three canker sores in various areas of my mouth and throat. I 've been back to the ENT doctor many times with no help. After about the fifth visit she thought i migh be a upper GI problem, so she sent me o have a scope done(which took about two monthes to get done.Results not the cause.Back to my ENT doctor she does more blood test for autoimmune diseases, two weeks later those results came back all ok.Where do I go from here?Sick and tired of feeling sick and tired

Were you on a lengthy antibiotic regime at any time? I think I have some things you could try. I am a clinical nutritionist and have dealt with these kinds of symptoms before. I would first suggest you cut out as much sugar in your diet as you can as I believe you are probably dealing with a fungus infection of some kind. Then I would begin eating yogurt with active cultures three times a day. For supplements take, 1 mega multiple vitamin/mineral tablet a day along with 50,000 I.U. of Vitamin A once a day for a month. Cut this back to 25,000 I.U. for the next six months and then you can go back to the recommended daily dose. Also take one B-100 complex (not made with yeast) a day. Drink plenty of good filtered water every day to flush the toxins produced by the fungus out of your system every day. (not fruit juice...WATER) I also suggest you read the book: THE YEAST CONNECTION by William G. Crook, M.D.