I was going to start going to treatment but I'm a highschool student taking 3 college classes plus my extra cirics so I decided to just keep my mouth shut for now. But I do understand how you feel. Everytime I pick up my books I just want to go to sleep. And I do sometimes. But sometimes you just have to make yourself sit up and do it. A suggestion would be to do it somewhere where you have to sit up and people can see if you're working like the kitchen table. My personal favorite place is the library. I go with a friend and I have to complete at least one assignment befor I can go find a book. And another before I can start reading. If I don't finish all of my work I'm not allowed to check it out to finish it. That works for me.
But what I really wanted to comment on is your last self injury. It makes me feel awful because that's the last time I did too. And even worse, it was my birthday. So I definitely understand. So here's a hug to maybe help you through and remind you that you're so not alone in this.