You are allowed to terminate your relationship with toxic family members. You are allowed to walk away from people who hurt you. You are allowed to be angry & selfish & unforgiving & don't owe anyone an explanation for taking care of you.
One thing at a time. Know the problem. Learn to listen. Learn to ask. Distinguish sense from nonsense. Accept change as inevitable. Say it simple. Be calme. How to work better, ten simple things that make a huge difference.