You are fully within your rights to tell the new therapist that you don't want to drag out your history so you only want to touch on the important things in order for you to get to working on what you need now. I've told a therapist that before. It was when I didn't want to rehash the details of my sexual abuse. She respected that and we went on working together for years until one day it just came out and I started working on dealing with it. I know it's a little different situation with you, but again you can tell the therapist that you don't want to go over a long history and just want to touch on important things and move on to today's/current issues.