I'm glad your sis was there. I'm glad you have a determination to do something each day to move yourself forward. That's essential. In fact, I need to be more diligent about that, so I'm going to take inspiration from you and renew my determination.
Make sure you have some ways to calm yourself down. Some breathing/meditating exercises. And have an appropriate mantra handy each day. I found it very helpful to keep a gratitude journal. First thing in the morning I'd write down 3 things I'm grateful for. Then, to remind myself that I have power in my life, I say out loud "Today I choose...[to be happy/to take charge/to move forward/...]"
You are doing the hard work to change your reactions. Good things will come from that.
