I agree with your T, the initial one could be how you felt, that the session was a "lifesaver" or such. Maybe the normal course of thinking, turning good to bad might have caused the second?

I think it depends upon so many factors! What medicines do you take, what your diagnosis is and what they think you might suffer with, the state of your thought processes in general, stuff like that.

I know I had hallucinations from a medicine..and they were all good