I used to go days without showering etc. when I was really depressed. I shower at least every other day now, and I feel much better. I think maybe going to the store and buying yourself some self care stuff could help you get motivated. A new razor or veet(or other) hair removal, a bath basket containing different soaps, body washes, scrubs and shampoo. Get some comfy pajamas and maybe some candles to light in the bathroom. Make it more of a relaxing thing and focus on how the water relaxes your muscles and how comfortable you feel afterwards. I think making it more of a pleasant experience can help rather than just say jumping in the shower getting wet getting out drying off and still feeling like crap.