That is a great deal of trauma. You are not worthless and you are not ugly its just your mind playing dirty tricks. You will get through this.

I would worry first about your safety. Make sure all locks on the windows and doors all work properly and are secured. I would ask neighbors and friends to look out for suspicious activities near your home and to call the police if they notice anyone near the home or parked outside. Keep in contact with the police.

Your school work should come second because it helps in two ways. Better grades move you ahead and studying keeps the focus off of the breakup. If after four years that is how he behaves??? It hurts so cry, and cry, but do not give up on yourself. You deserved much better.

Try and help your bother. Talk with him. See what is going on. Is this all new behavior? Has anything happened? Then research on finding a therapist for him and encourage him to go.