Every Sunday ends the same

I’m stuck in a really bad pattern, I’m burnt out parenting my audhd child and also just recently received my ASD diagnosis myself. I work 3 days a week in a physical and emotionally demanding job and am studying as well. I’m almost failing my classes as I just don’t have the energy to keep up with it all and I struggle with starting challenging tasks. Every week on my days off I plan all the things I want to get done but it just never happens, I get almost stuck and just can’t get into what I need to be doing. I’ll do one or two things then that will be it I either get side tracked or just can’t mentally go on. Then it comes to Sunday and I’m an anxious mess as another week is starting and my house isn’t clean enough, I haven’t had enough quality time with my child and all the tasks I need to accomplish for the upcoming week are weighing me down. I have tried so many different things like writing lists or just making a goal of one thing a day but it still is just too much. Does any one have any advice, I get so low come Sunday night and I end up staying up too late stressing about the things I haven’t done and then start the week exhausted, I need help but don’t know where to turn or what will help.