I'm so sorry. Losing a parent, especially when kind of unexpected is really difficult. I had a similar experience when my stepdad passed 3 years ago. Deep breath. Lean on friends/family/coworkers--whoever lends a hand, an ear or a shoulder to cry on. If they want to help, accept their help.
I'll never forget in between sessions of my stepdad's wake--I had everyone at my somewhat small apartment. A neighbor actually brought several trays of food from a local restaurant to me that morning, someone else brought wine, my mom's best friend washed my dishes...it was so awesome. I couldn't bear normal tasks during that time period.
You will go into survivor mode and do what you need to do. You will get through this although it seems like a nightmare right now. Time helps. Right now you need to eat, sleep and be kind to yourself. Hugs. I'm so, so sorry.
My grandma recently passed and the pastor from her church talked to the family before her service about grief being a path that we walk/journey. And while the path is hard, those that do the work of walking the path will find healing in the journey. It was super hard to hear and I cried, but it made a lot of sense to me and has helped me in the days since then. So I hope that you can find some peace on your journey.
It feels like you've been kicked in the stomach. I'm so sorry. It'll take everything in you to put one foot in front of another. It will get better, but for now it hurts so bad. We're here for you.
"Why would you ruin perfectly good peanuts by adding candy corn? That's like saying hey, I have these awesome nachos, guess I better add some dryer lint." - Nonny