GG, you nailed so many things, I can't even begin to say thanks. I'm doing so so much better after a few days. You're absolutely right about grief and skipping the initial stages. Because nothing happens that isn't 'allowed' there is no denial or shock, but something about the 'encroachment' on what has classically been your 'territory' still feels painful.
I think it explains why you can say, and really mean it "sure, have fun!" And still feel a sting.
To those who feel like a wreck: you WILL get better. The new normal will feel normal. Hang in there and put on as cheerful a face as you can.
GG, I may not like them, but I look forward to the opportunity. It looks like I will get that. It's a big part of the relief.