Thank you to everyone who posted words of support here. I wasn't sure why I felt the need to post up such terrible news here, and so quickly, but it felt like the right thing to do. I desperately wanted to boldly state my feelings for my father from the highest "mountain top" I knew. I am deeply greatful to be a part of this community and for allowing me to say what I felt inside.
Many tough days lay ahead, but everyone's words of support and stories of similar situations have been very very helpful. Thank you all.