1. Basic self care: get enough sleep (~8 hours a night), eat plenty of healthy food and cut out as much junk food as possible, and make time for doing something you enjoy each day, even if it's only for 20-30 minutes.
2. Therapy: Either straightforward counseling or something more involved like EMDR or neurofeedback brain training. I can recommend the latter. It has truly changed my life.
3. Spend time with people you love and who love you. Self care and healing would have never been remotely possible or effective for me if I didn't have solid friendships with a few people who truly cared for my best interest and a good relationship with my kids and spouse.
*EDIT: I forgot to add, look into taking medication. I take a small dose of Lexapro daily and it has made a huge difference.
In order to heal and improve your situation, you MUST make time for these things. Don't try to add them on to whatever your day to day already looks like. Cut out other stuff as much as possible and increase the amount of time you spend on 1-3. Be forgiving and kind to yourself with this part, but do be as ruthless as possible with making time for 1-3.
In my experience, taking care of self and being involved in healthy friendships and family relationships creates a situation where the confidence and will to make changes to things like your job becomes possible.