How is it best to act w/ dad recently diagnosed with AWFUL cancer;super energized and wants me to drop all.?

My dad has been recently diagnosed with STAGE 4 rectal cancer (Stage 4 means the original rectal cancer has spread to many other organs, and also to his bones). We will meet with an oncologist in a few days & will learn about what treatment/life expectancy, etc we can expect. My problem is that we have always been pretty close, despite the fact that he is a very difficult man to deal with. Now he seems in a rush every day to get whatever he can done. My problem is that I do have my own life, my own little family, and I did drop all and stay with him, going to every single medical appt. to take notes for almost 6 weeks already. Then I came home for a few days and now he is saying that he needs lots of help with various things, and implies that I should be there. PLEASE help me deal with this agressive type man whom I love to pieces. I want to be there for him as much as I can, but cannot ignore my own life, which even means no time to even pay bills, wash clothes...