I’m so sorry you’re having these kind of problems with your mom. It’s time to move out. If your mother is threatening violence to you and trying to strangle this is not the time to try and negotiate with her. If it happens again or anything even remotely close to it — call the police. Your mother’s lack of sensitivity and inability to resolve a relatively small matter does not bode well for the future of your relationship. I would highly recommend you work on doing what you need to do to move. This may mean moving in with several roommates or finding dorm space at the University. I would also recommend using the university counseling center as you transition out of your house.
Often I recommend counseling for family issues — but if your mother is trying to strangle you it is not time for counseling for the two of you — it’s time for counseling and action for you.