I am another person who has seen white stuff in my stool. When I take anti-candida herbs I see the white stuff in the toilet. I know I have candida and I know it is candida. God bless your doctor and all but you know what that is.
As for when you were eating the bananas: I was reading a book( I think it was an old Adel Davis book)and in the book this mother was worried that her baby had worms and the doctor asked the mother what she had fed her baby that day and she told him bananas. The doctor said that the stringy things in the baby's stool was cellulose from the banana. Nothing to worry about. Now if you want to get candida under control I would advise to stay away from bananas for a while.