You're amazing! Dealing with all of that at once is a great achievement.
First thing I would do is make an appointment with your uni's counselling service. You need to talk all of this through with a real person, even if it's just to vent at someone outside the immediate issues. The internet is sometimes no substitute.
There's nothing stopping you going to uni later, whereas the cancer is a more immediate and dangerous situation. In your shoes, I'd put uni to one side for the mo and concentrate on recovery. You don't actually have to do all this at once. Treat yourself a little more kindly x