Aaah that sucks. My dad died a few weeks back. Aaaand you sorta just go on with life. Of course, there are days where you just break down and cry your eyes out, but really, there's nothing much you can do about it. Plus, people around you may be sympathetic and all, but to me they seem annoying at a point. Cuz they don't know how it's like, and all they can say is "I'm sorry." Plus, they expect you to move on, when you really can't.
It's hard, I understand. But your dad probably don't like seeing you like this right now.
Just go with it, you know what I mean? Embrace the sadness, the pain. But don't overdo it.
Life goes on, and it will never wait for you.