Right, I'll wade in.
I have an adult DX in middle-age, much to my surprise. The "label"* has been of great help to me as I now know why I don't fit in and it has enabled me to find people like me. Though there is a wide range of effects and people use different coping strategies. The key thing is to find coping strategies that aren't harmful to either yourself or others.
It has also made me aware of how patchy the support is but I've also heard a lot of success stories.
The place to start is the NICE Guidelines that were updated last year. ADHD is very heavily researched and the guidelines state how it should be managed.
I've found the Adult ADHD group on FB very helpful, run by a guy who really knows his stuff.
If you're near Liverpool, they have a fantastic drop-in group and course - Ladders of Life. There is also the work of ADHD Foundation and some other charities.
Russell Barkley has a lot of info on You Tube. "How to ADHD" is good, especially for younger people.
The one thing I'd say is that it's up to me if I share my "label" and as DH is just saying to me it's made not a jot of difference to anyone else. Been very helpful for me. I'm not medicated and now realise how to adjust my life to make it a lot easier.
*Personally, I'm now finding the use of the word label difficult...it's a diagnosis as it's a neurobiological disorder with a strong genetic component.
I'm also in the "it's a gift" camp, even though it's made life quite awkward at times. :-)
I suffer with the emotional sensitivity thing, so I won't be back to this thread....hope this helps tho!