What is the most pathetic moment in my life?

I am so sorry to hear about your mother and I will keep her in my thoughts. I must say that this is not a pathetic moment at all, but more of a moment in time of your life where there are many things that are changing. It is a big change, and I can only imagine that it is quite overwhelming. I have not been in your situation, but have gone through many difficult times in my life with being chronically ill for many years that has swallowed all of the normalcy in my life. I can encourage you to spend all the time that you with your mother, and cherish those times. Please make sure that you express how you feel to her and it sounds as if you do love her and tell her that. I wish you the best.