I struggled with ADHD all my life, but being a child of the mid 20th Century, there was no understanding of ADHD and no help. I always had a sense of being a bit "different" than other kids but because I was bright and a people pleaser I hid my struggles well.
It wasn't until I met a man with diagnosed ADHD later in life that I discovered that that was my lifelong problem. He suggested I read a book called
Driven to Distraction so I would understand him better. He had lost girlfriends throughout his life because none of them understood him or were willing to cope with the unique quirks people with it bring to a relationship. I found myself on every page of the book, it was a real eye opener for me. I have textbook symptoms tracing all the way back to childhood. The only thing that has changed for me over the years is the hyperactivity component. As a child I was bouncing off the walls at times, as an adult I am far more sedentary (although physical problems contribute to that somewhat.)
I highly recommend this book for anyone who suspects they might have ADHD or who love someone with it. I'll tell you one thing, it's a challenge when one partner in a relationship has it, but when both have it, things can get real "interesting."
Here is an interview with one of the authors, Dr. Hallowell who, incidentally, also has ADHD...