Hi KT,
Welcome to the board...it's a nice place to come and breathe.
First of all, it sounds like you are just now coming to grips with your therapist's opinion about your husband of 10 years. That, in and of itself, is something to grapple with. I don't know what to make of the very harsh terms your therapist phrased it in. If this truly reflects the level of emotional abuse you are subjected to, then you need first to find a safe place to think things through and PLAN.
If things are relatively palatable right now, you may want to slow down and take it one step at a time, if you are not in any physical danger. If you are, get yourself a lawyer quickly and educate yourself immediately.
But I hear a hint of ambivalence in your post. I just got back from the bookstore (dealing with elder issues) and noticed a new book by Nina Brown called "Loving the Self-Absorbed" a sequel to her other fine books. At the very least, you will need to learn how to set boundaries in a neutral and self-respecting way. Plus, you'll want to protect your children from any verbal abuse...
As you read through the other threads, you'll also notice that leaving is only one option and/or piece of the puzzle. Even if you leave, you'll want to continue to work on yourself so you don't get drawn into another similar situation!
Other folks here have more experience in this situation than I, but I wanted to welcome you aboard. Good luck with your quest. S.