Have you addressed this in therapy? There are many skills you can use for work stress and general anxiety. But if that is not something you want put the effort into then maybe a new slower paced job is for you. I dont really know of any jobs where boss's dont want efficiency. Most low wage jobs have interactions with customers too, and coworkers are also something you need to learn to deal with in the workplace. Maybe data entry? Thats a pretty solitary job. I've always thought being a postie would be pretty cool too.