I encourage you to not give up on communication. Obviously I don't really know your situation...you seemed to have gone through the motions of speech therapy. How many clinicians did you try? Do you feel that they really understood you? These things can make a big difference. As for the tongue biting secondary behavior, this can be successfully treated with therapy. While stuttering as an adult is most likely not curable, the way we react to it is. Have you ever been to an NSA support group meeting? If not, it may change your way of thinking.