I am sorry your rotten sister in law chose to make things even harder for you. What wretched thing for someone to do to someone else.
I understand you don't feel safe enough to post anymore, but there is still a lot of support to be found. Please don't stop at least READING the posts here. There is still so much valuable information to learn. At any given time there are several people at exactly the same point we are whether it be newcomer in pain or old-timer with wisdom to share... getting and giving advice that will apply to what ever you are going through.
Hang in there abbcc. Don't go too far away....
Hugs