1. Loved ones death
What you could do to get over this is think about their great life and how they are in a better place now.
The way you could try and block out or help a family fight is try your best to stay out of it and, talk to both of your parents one on one on how you feel.
3.Too Much Homework
What you could do for this is try to do some of it in your free time at school, and dont wait till last minute at home.