TBC ~ That is terrific news that you've gotten away from your ex. Thankfully, CPS saw that your son is completely safe with you and closed the case! I am sure that the worker wasn't trying to be kind and thoughtful with you, her entire purpose was to see how your parenting was...for the safety of your son.
Either way, that is now behind you. Congrats on getting approved to start back up with DBT. I hope that you get a helpful grasp on some techniques to help you cope new challenges thrown your way.
Take care!