Guilt is a normal part of grieving however as you come closer to peace, your guilt will gradually fade. Remain faithful and entrust in God. Talking with your loved ones will help give you the closure necessary to move on.
If you are suffering from a terminally ill sickness, remember that peace will help you feel better about passing on. While leaving your loved ones is a difficult concept to address, being at peace with yourself and life will help the emotional aspect be less painful.