This is true for any loss. When I stopped drinking I had to come up with some sober activities ASAP. Ditto when I stopped smoking. And on down the addiction list … It always feels uncomfortable at first. That’s a good sign. It means you are processing emotions, which is part of closure. If it felt cozy, then I’d say you weren’t doing it right. But change can be fun and challenging at the same time. And you’re allowed to use four lettered words if you don’t like it at first, unless you’ve given those up too.