I'm in a similar boat. Signed papers a couple of weeks ago.
I don't know if this is what you're experiencing, but thinking about that big future out there wide open is a little off-putting for me right now...I'm certainly not afraid of it or shrinking from it, and I'm glad it's there, I know it's there, but also not in a huge hurry to get somewhere fast, either.
But it's coming for us whether we want it to or not. Now is the time to be getting ready.
Like you I'm focusing on all of the good in my life (and, really, there's a lot!). Doing things (like gym, hobbies, activities, socializing, etc) that are like investments which are good for me now and will also pay off more in the future. Also spending a lot of time with the kids, then making sure I spend time with people my age as well, for balance.
As a poet once wrote, "When drinking is bitter, become wine."
