I can relate. Feeling unloved and like a waste is so hard 😥 I too use to work for a non profit in behavioral health. It was extremely hard and very unrewarding, at least for me. I had a hard time managing my own mood when I was having to help others manage theirs all the time. I hated my job, and the only thing I could think about all day was being able to get back in bed at the end of the day. Once I moved jobs, I've been doing much better. A job change may be something to look into.