Yes! the aggression does serve a purpose. It gets you into the fight mode so that you can kick the horrible attack on your health. Caregivers get it too! I was SO angry that Cancer attacked my son! I would not, could not - consider even for a second any alternative but survival for him! About the guilt - don't worry about that - you can always say "sorry" later. The people close to you will understand. Right now - stay in the fight mode and it will serve you well in the days ahead. There are lots of caring people here who will help you every step of the way. So stay close and let us know what's happening.