I've had similar experiences. Once was relatively recent (back in June) after a session with former T. I called her in a panic and pretty much begged her to tell me all the reasons it wouldn't be true. She was very kind about it though. She pretty much told me that I did not need to "know" if it was true in that moment, but just deal with the emotions (though she said it made sense in terms of other things I had talked about)... I don't think she would have doubted anything I said, but worked around what it meant for me...

It's weird how our brains can pop things out at us like that.