I"ve been in a real funk lately which has been hard for me to understand because we've achieved "FU" money and the point of retirement inevitability.
"Why am I not happy? This is what I wanted!"
I think the answer in my case is that to achieve this I've been commuting to a job to toil away at a job that is no longer challenging, frequently frustrating, and at which I'm surrounded by people who (for the most part) don't share my values. For a long while I had an answer to the "why" question (FI). Now, I don't. People are often depressed after achieving a goal they've long planned and prepared for, then executed.
Another dimension to it is that I'm more aware of the passage of time, and of not wanting to waste time. So the price my current job and lifestyle extracts each day/month/year feels marginally higher.
It's common to idealize things that lie in the future, otherwise why would we strive so hard for things? It keeps us moving forward.
What I'm doing now to navigate this gauntlet (besides talking to a counselor to work on anxiety) is to look back to the past ten years I have spent in my current job (that I'm tired of) with gratitude. I actually made a list of things that I've been able to do in this period of time that I'm particularly proud of, or that the money from the job has allowed me to do. Top of the list: Financial independence, followed by such things as: Paris, Italy, Ireland, 4 half marathons and a marathon, Springsteen in Croake Park.... you get the idea.
I'm simultaneously working out a list of creative pursuits for when I leave my job. Reflecting on the past and what I have achieved has boosted my esteem and helped with energy. I feel like I can get some of my "old self" back. Right now I feel tired, burned out, and cynical. It's helpful for me to think of myself as the "world traveler" who did a marathon -- the latter being something I thought I could never do. I remember feeling really let down afterward. I should have been faster, blah, blah, blah. Maybe the point was that I would have never felt high on the mountain just after doing it. Maybe the point was that three years later, when I really needed some inspiration and motivation I would need something to remind me who I really am -- I'm that person who summoned the guts to start running at 40 and completed a marathon. It's my little miracle.
So this current state is like an emotional bridge between the two states, and it's kind of uncomfortable, but it's a way forward.