In your dream, your mother is actually your protector. When you dream that your mother doesn't want you, you are actually afraid of you or worried about some bad things, such as someone who can help you leave, or something beyond your ability that needs you to do.
In short, you have been in a bad mental state recently and are prone to anxiety. The crying in the dream will be alleviated, and you need to regain your spirit and regain your confidence.