I don't think anyone else can tell you when you feel better? I think too, like Cyran0 says, you have to feel what you've learned is sustainable, that if you start slipping you have new tools to help you. You don't get any gold stars or anything or a certificate/plaque since it's up to you (unless you give yourself one to commemorate the work you did in therapy, does does sound like a good idea :-) and whether you feel you're better. No one else can get inside of you and tell.