I am so very sorry to read about your sister. It's always difficult to make decisions about someone's life. She struggled for quite a while and now she's at peace w/o the pain and suffering.
You sound well and grounded. Take your time figuring things out. Don't rush into doing anything when you are angry. The most important thing is to take care of yourself.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.