It's great to have you here wherever you post. And it's great that you have such a strong core group of friends on the site.
The adjustments are astonishing in their depth and breadth. Having friends and activities that keep you grounded are invaluable.
For what it's worth.. just after the darkest days of winter, the days slowly get better. Not right away. It doesn't even seem like it's happening, but it does. The transition is always the toughest, especially going from being THE DadDog to being the 'holy crap what do I do now' single man when the kids aren't there.
You sound like you already do all the healthy stuff for your body. You're great at stating if things are good or bad. There's two ways to process this experience... the Velveeta way or the Gouda way. Me.. I'm going for Gouda. It might take more time but the result is worth it.