Your conflicts with your brother and other family members has been a constant theme. This is not a criticism.
Your remaining involved in this conflict keeps you emotionally enmeshed in a situation that has no easy or obvious solution, and for which your continuing involvement only brings you increasing misery and heartache. Taking the necessary actions to free yourself from such a destructive relationship is the cutting edge for you.
It's likely that your new therapist can help you through this process.