Everyone has given good advice which I agree with.
I have a practical idea. My kids are grown and gone. The day they left I would spend that night rearranging the furniture and fussing with the rooms left behind. It seemed trite, but (a) it kept me busy and (b) it wore me out so I could sleep that night. It also meant that (c) when I woke up the next morning I wasn't looking at an area that had been recently vacated, with holes where furniture etc. had been, but a room that had been "rearranged/ redecorated". It made the next morning, and the next and the next... just a little easier.
I think this may help you too?