I told work, but mostly because I first only told HR, who shared HR policies and how they are obliged to support. I only told my line manager because he's a good egg. But judge it based on their merits. I had a line manager once who was awful and everything I said could and would be used against me. She wouldn't do anything obvious I could prove, but it was pass ag bullying all the way.
But if you trust the manager/hr policies then I think it's good to because you are entitled to support.
My only pointer would be the "so what?" Test. What can they do for you or what do you specifically need as a result. If an employee disclosed something to me I'd want to get it right for them and help them but would want to know if it's time off, adjustments to working patterns/ or just a casual fyi just incase. That will help them find out the right kind of stuff.
I think I didn't give myself enough headspace at first to process. So if you can take some time to immerse yourself in it and process, for me that would have prevented me burning out later. And the point of that immersion would be to learn and adapt to make your life better for you (before anyone cries out that you'd over identify with adhd and not be able to see passed it).
The thing I'm finding hardest now is swinging between the positive and the negative. One moment I'm laughing at myself, and seeing the benefits of it: im quick witted, out of box thinker, able to move mountains when I hyper focus. The next moment im terrified at the potential magnitude of living with this "disability" worrying if I am an unfit mother, if my husband will leave me because he is sometimes my carer, and fretting that I'll be shipped off to live in sheltered housing.
I look forward to it settling down so I can find the balanced shades of grey in between, get back to work, and hopefully be far more successful in my endeavours with this insight.