It sounds like you have been dealing with several losses, the loss of your mother, your job taking care of her, the understanding of your family, the sense that you made a good choice for your mother.
And it sounds like you are dealing with one gain--more time than you have activities to fill.
Best kickstart choices that I know about are
1. taking educational courses (photography, geology, database) to get out of the house, meet new people, and get your mind moving ahead,
2. short termed grief counseling (all of the losses fit that),
3. doing things, like going out more, exercising, starting or picking up a hobby, joining some kind of group (community service, political, theater).
Hope it gets better soon,