It can sometimes take a while to change habits that you have had for a long time. When you are depressed, you can get into a rut and begin seeing things the same way, so even when you try to change, it gets met with a brick wall.
It may be that the goals need broken down into smaller steps. Instead of trying to find something to look forward to in a few days, try in the next hour. So if you accomplish doing the laundry for instance, then treat yourself to something you enjoy right afterwards. Even if you only indulge for five minutes, it's something you can feel good about.
You may want to talk with your daughter about making other plans. Maybe make it a half an half weekend. For example, she gets to watch 3 movies if you both go out and do 3 activities you like to do. That way, you don't feel you have devoted all your time just watching TV and she gets to share in what you like and maybe develop a liking for it too.
You may also want to try something new and out of character this week. Something you have never tried before and wanted to. It can help create new pathways in your brain and help promote endorphins, which will make you feel better.
Try not to accept blame for the break up. Your boyfriend was the one who left so he had his reasons. But when someone leaves a relationship, it is often because they have issues. More times than not, it is about them and not you. Accepting blame is only making it worse for you and will get you into a self destructive loop that you will have trouble getting out of.
Let me know how it goes with your therapist next time you see her,