Let me start by offering my condolences on your loss. I know that this must be an incredibly difficult time for you. Since you asked for advice, I'll begin with the obvious: You should consider taking at least a week off from work. The work will still be there when you return. I'd also recommend not trying to rush the grieving process. I would, however, encourage you to (for now) put out of your mind all of the "woulda, coulda, shoulda's" because anything that resembles assigning blame is not going to be helpful to you. You've now embarked on a difficult journey. Embracing that journey is one way to honor the memory of the loved one you've lost.
I am sorry for your loss.
I lost my father early. Much earlier than you did. I am sure his death could have been avoided by different life decisions. I have also lost my friend. In the end the end is end and regret does not bring anybody back. Still feeling sad is humane. You probably need some time for mourning. To not forget but to accept the new reality without him.
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Sorry for your loss.
Your father would not want you to stop your life. You cannot change the past, only the future. Take the lessons he taught you in his life and his passing to make the future better for you and your loved ones. Slow down, spend time, pay it forward as he did for you.
https://youtu.be/PuPYIfcSz_Y
All the best.