Hi NoSaint and welcome!
I don't know if my working hard was overdoing it or not. I was fitter than ever before in my life, physically and mentally. But like
@Sabina and most of us, FM has definitely taught me self-care and that's my new benchmark of success.
"Life is what happens when we are busy making other plans..." No one knows that better than people who are suddenly hit by illness. You were and sort of still are lucky in that so many of your plans have succeeded, probably luckier than most, and done a lot for it. But even you will have faced challenges and adapted and adjusted to get where you are. I did at least. This is the big one, might become your new challenge, your new success story, if you let it...
If you're finding it hard to just jump down the ladder as if it were a chair and realize it's all just in your head, praps inspiration like Timothy Ferriss'
The 4-Hour Workweek can help you subtly change what success actually is for you? - No need to read it all, a summary'd do - it's just about the gist of re-defining what you've been considering as work, taking the pressure out of it, delegating as much as possible - falling up the ladder, and making your life fun again in a different way than before.
The nitty-gritty of it may well be to pace down until you find you have a certain amount of energy again, and then energy-saving ways of still getting some things done. It seems to me you'd know how to guard yourself from losing your assets and saving your energy for the important things will help tone your lifestyle if that's necessary, to prevent "benefits" from being more than a vague apparition in the distance. The quicker we come to our senses, the more likely we can adapt & adjust. A kid I saw yesterday had a Stephen Hawking quotation on it in the "dialect" of "Leet", saying "1n73ll1g3nc3 15 7H3 4B1L17Y 70 4D4p7 70 CH4NG3" - for those with fibro fog or blurred eyes etc. that reads: "Intelligence is the ability to adapt to change". The fog and blurring can challenge our intelligence, but there's loads of workaround in store.
Maybe considering grieving and acceptance - to be able to start thru under a new premise - isn't where you're at yet. But
this is the thread about (stages of) grieving to be able to self-motivate again that
@Auriel's referring to...