The fears I felt were about the unknown. The unknown is always scary to some degree but often exciting at the same time.
I didn't know how AH would react. For a while I feared he would commit suicide. I didn't know if he could handle being alone. He can. Even if he still doesn't want to admit the depth of his problems.
I didn't know if I was going to be able to stick to my resolution to leave and stay gone. I worried that others would think badly of me for leaving. I worried about all sorts of stuff that never came to be.