I have found that trying to get in the habit of taking care of myself helps. So putting on jeans and a top, cargos, denim skirt instead of dagging about in loose and ill fitting trackies all day. I also try to do my hair and a touch of make up, nothing flash but gloss at the least. I fell into a rut of not investing anything in nurturing myself and I like to look nice, it makes me feel better rather than being a reflection of my value. I also allow myself a small budget for updating my wardrobe - simple scarf, mascara etc to try to swap things around.
For me exercise is important to my mental health - tricky with a back injury but is there anything you have been recommended that you are not doing? Swimming? Walking?
Also crap food makes me feel worse than healthy stuff, so lots of soups and salads here at the moment. I also try to menu plan my snacks etc so not to be tempted by junk choices.
Most importantly I try to focus on the good stuff that has happened at the end of the day. So a reflection of 5 positive points regarding the kids, me etc. No allowing you to concentrate on the areas you could have done better on - I really think this helps change your mind set but it does take some time.
You are worth it and deserve to feel better about where you are at. I think most people struggle at times too. GL xxxx