I am sorry you’ve had to move back home and have to deal with your mother and sister. I think the best course of action for you is to establish micro-goals. Have a rich plan for your day which include ongoing micro-goals to help you engage. You can do this by breaking down what there is to do that day into a series of much more immediately available tasks. Micro-goals involve breaking a larger goal down into smaller one that are quicker to engage in and easier to see through. Instead of clean you room the micro goals would be to pick up your clothes, clean off your desk, organize your papers and vacuum the floor. Smaller micro goal keep us engaged and getting feedback that we are getting things done.
Secondly, do everything you can to be out of the house and away from them. Take walks, bike rides, homes — anything that will keep you busy, engaged and distanced from your family.
Finally, I’d make the effort to check out what classes you could take online until you can get back to school. This will help you stay engage while helping you stay away from the family until you can be on your own.
Wishing you patience and peace,
Proof Positive Blog @ PsychCentral