I am terribly grieved for you and your family. For this to have come on so suddenly, and for Christopher to have been taken so quickly, I know is heartbreaking and devestating.
If there is any consolation to be found, please remember that your brother knew unconditional love from family and friends, that he was at home in a peaceful environment, and that all the pain and suffering he was enduring has passed. You did everything that you could and no one could doubt your love, concern and enduring hope for his health and well-being.
For yourself and your family it is a time to weep and grieve and reflect and remember. No consolations will ease your pain, but I will continue holding you in my meditations, thoughts and prayers as you undergo this inevitable proccess.
Heartfelt blessings and love for your, and my very deepest condolences.