Hi Brennan! I'm sorry to hear about your daughter
I know that things like depression and anxiety can be really big motivators to overeat, and therefore can be rally big pains in the butt when you decide to try dieting. I have really bad anxiety--which was much worse before I started losing/regaining some of my self esteem--and I would DEFINITELY comfort eat after a bad day. My suggestion to you would be to try to find some calorie-free activity that preferably keeps your hands busy (knitting? Jogging? A video game?) that you can distract yourself with when you start to feel like comfort-eating.
I would also find a low-calorie snack that you love (I'm a fan of those 100 calorie popcorn bags), so that when you DO get the urge, you don't have to deny yourself on those really bad days (because I don't know about you guys but I go STRAIGHT for the cookies when there's no easily accessible, healthy alternatives), but you hopefully won't go overboard, either.
It takes a long time to train yourself out of going to the cupboard when you're bored or upset, but after a few weeks of being strict with yourself, you'll hopefully be able to get your kicks somewhere else.