Dear dogzrule,
I'm so sorry you were in an abusive relationship. But hats off on recovering from it.
Your abusive ex may or may not cause problems - you are right in worrying about your safety....it's always good to secure yourself.
I request you to check out this site -
Crime Safety Security for women & children
Knowledge is power.
Here are a few other things you can do -
1. Learn basic self-defense - it's a must for all men and women....you may never know when you may need it.
2. Get pepper spray and keep it somewhere accessible.
3. Ensure you have proper locks at home and a peephole at the door. The lock doesn't have to be fancy electronic - good old solid lock shd do.
4. Always keep doors and windows locked.
5. If you still feel insecure....maybe you can move out? Or get some roomies to live with you?
Your paranoid thoughts wd, I think go away when you takes steps to secure yourself.
Good luck!