I hope you are working through all of the what ifs with your psychologist, as it can be a hard gig.
My inlaws fostered for years and the things that the children had seen and dealt with, they in turn had to deal with too as well as the difficulty of saying goodbyeetc.

I don't know you, or your history, besides what I have seen on here, and I'm surprised your psychiatrist thinks that a child in a vulnerable situation is a good "distraction" and a way to help you, but I'm not a psych .

I really do hope you have something beyond an amazing support system around you, and best wishes for the assessment tomorrow, let us know how you go.