Don't go back until you are ready. If you are feeling so bad right now try to distance yourself from him for a week or two. Do not talk to him, do not meet with him. When we are in extreme stress we find it hard to deal with almost anything in life and making good decisions is extremely challenging. Recovering from stress takes time and distancing yourself from the main source of stress is a key component to recovery.

Do you have anybody to help you with your kids? How long can you live away from him (i.e. is this "alone time" restricted)?

You said you are working on your degree. Are you productive right now? If so - concentrate on that. If not - take a break from it, too. Your health is important, if you don't recover all the challenges will keep on dragging you down.