Shit, I was just thinking about this as I was writing on another thread. I held my tongue there, but I can't do it any longer, so tl;dr, here goes:
I am FIRE, but DH is not. He has excellent reasons to keep working for five more years, including an excellent pension with really good health care. I said the S-word, but I do not want to come off as a complainer, so please try to keep that in mind as you read my tale.
To borrow from Eric222, my life is an exploding volcano of awesomeness. Except for this one teeny, tiny little thing. When my FIL died, we realized MIL has Alzheimer's (they were propping each other up, apparently), so now she lives with us. We had to sell our fixed up, low tax base, affordable, but no downstairs bedroom house(s) and buy one big ol' clown house so she could be safe. (Her local house is a tiny shitbox that's falling off the foundation and has a cloudy title and her nicer house was too far away.) So here I am, all happy to be FIRE and then this happens. I'm not whinging, just pointing out that it's possible to think your life is headed one way and then it makes an abrupt turn. Thank goodness I don't have to deal with this, small kids AND an asshole boss.
So my challenge to you is to figure.it.out. There are new friends to be made, new opportunities to explore. You don't get handed a bunch of friends to play with just because you retired, whatever your age. You have to get to go out and create a new life for yourself. In the process, you will find it, and your life will become an exploding volcano of awesomeness, too. (Thanks, Eric222.) It sounds hard, but it's so, so much faster and easier than achieving FIRE, and you managed to do that just fine, right? Remember, if all else fails, you can always go back to work. Anywhere on the planet. But don't give up just yet.