I feel like that a lot! Often after therapy I'll think I was lying or the therapist misunderstood me and I just didn't correct her. And then when I have a good day, I'll think I'm fine and I'm just making everything up, lying to get attention, lying to not have to go to work. But not just in relation to therapy. It's also like that for instance at work, and I'll feel like I'm just cheating on everybody. I've never mentioned this in therapy, cause I'm too scared that they'll decide I'm lying about everything and that I don't need help.