I cant take it anymore! I have tried underwear, boxers, stickers, candy, toys, ignoring, schedules, cheering....Im exhausted! He will ONLY reliably potty if he is naked from the waist down. School starts in a month and I still don't have him trained in order to go to kindergarten. I even used school as a reward. He is so excited about school and I keep telling him that if he potties like a big boy he can go. Wont work! Nothing is physically wrong with him. We have had...