Oh mac, I'm sorry to hear this.
I'm sending a big, comforting hug your way, from me to you.
I do wish I had words of wisdom, but really, I don't. It just takes time to get over something like the death of a parent, that's all. When my father died, quite a few years ago now, there'd be times I'd think I was functioning really well, considering .... but it didn't take much to bring the grief to the surface again & often I'd be left feeling very vulnerable, weepy & lost. On & off, on & off, on & off ...
So the only "advice" I can give is to be very gentle & considerate of yourself for a time. Don't take on too much extra stuff you really don't have to take on. Because you are very fragile at a time like this. Just let yourself grieve when you need to grieve. It's very painful, I know.