I’m sorry for your loss Darnley - we’ve spoken before I think?
It’s still very early days for you, you’re probably still in shock. Imo it will get better to some extent but it’ll never go away completely. There’ll be times when you feel you’re dealing with it ok, and other times when you feel completely overwhelmed. Don’t be too hard on yourself if you feel you’ve regressed, it’s all part of the process.
I hear you on the food and sleep issue. As far as sleep goes, I’ve tried everything I can think of, including prescription drugs, and nothing has helped. I know that I’ve brought this on myself by deflecting any upsetting thoughts at night time and refusing to switch my brain off. It’s now become such an entrenched habit that I’ve totally messed up my sleep pattern. So I’d advise you not to go down that route if possible! As others have said though, routine is important.
I don’t know if you’ve had, or would consider, any bereavement counselling? I didn’t think I needed any as I felt I was dealing with it. But I’ve recently decided that I do actually need some help to come to some sort of acceptance. Maybe it’s something to consider?
I’m trying to think of other things that have helped me but aside from the obvious things like the love and support of friends in rl and on-line, nothing’s jumping out at me! It’s just one of those horrible arduous processes that we have to work our way through in the best way we can. There are no rights or wrongs.
Wishing you all the very best.