Oh Imwarbaby! I know how you feel. My mother left us suddenly almost 12 years ago. She was feeling sick the day before and just a few hours later, I got the call that they called an ambulance. She died on the way to the hospital. She had a heart attack. She was 67 and I had just turned 31 five days before.
It hurt a lot. I never thought I could get through such pain. First I was hurt, then I was angry. Angry at her leaving and angry at myself for not being there for her. If I had done this....If I had done that....and oh how I wish I would have said "I love you" before I left her house the day before.
Feel whatever feelings you're having. Don't push them aside. But don't let guilt take over. You did everything within your power to make your daddy as comfortable and as happy as possible. He knows now all that you've done for him and how much you love him. He will always be with you. You'll always carry him in your heart. It's been 12 years since my mom passed and sometimes I can still hear her voice. Of course, this usually happens when I do something she wouldn't approve of.

She's that little voice of reason for me.
That old saying 'Time heals all wounds' isn't always true. The wounds of losing a parent you love so dearly never fully heal. But as time passes, so does the horrible pain. I can think of my mom now and smile, sometimes laugh. With time, you'll be able to think of your daddy and smile, even laugh.
What I encourage you to do is to think of the times your daddy made you feel special, when he made you feel loved and when he comforted you. But most importantly, remember the times he made you laugh. Those are the memoried that will help you get through the next hours, days, weeks, months and years.
God Bless your heart.
Love, Barb