What can I do?

My mom is lying on the sofa crying silently with the lights off at this time.. 2.45am ..but I don't know why.. Trying to recall am I the reason behind what she is doing? Did I say something harsh that hurt her? Hmm.. I don't know. She didn't answer me why, just asked me to go to bed. Haihz.. Useless daughter, I can't do anything for her. I'm always loud, impatient, and like to shout back. Why?? Shouldn't.. Shouldn't treat my mom like that anymore.. Sorry mami..I will try to control my temper k..cox every time I see u cry, I feel like crying too :'(