I hope you come back to this thread at some point because I have good news: a new book is about to come out that has great advice on coping with ADHD. The psychologist believes that ADHD isn't a medical condition, that it's just like being a different kind of person and it comes with its own needs. The book is called "ADHD 2.0". I don't believe it's out yet as of this post but nonetheless, here's a podcast where the writers talk about the book:https://www.youtube.com/watch?v=Rgb7bzfE__I
They mention something I don't think I've ever heard of regarding ADHD which is the importance of exercise. I know that meditation is supposed to help ADHD and I know that there are studies showing that exercise improves your focus but I didn't know how important movement was, particularly balance exercises so that's pretty interesting to me. In the podcast, they talk about how the cerebellum is typically seen as a kind of muscle-coordination-management part of the brain but giving children with ADHD sports exercises to participate in or balance exercises to perform, increases their ability to focus and that's with no medication! In fact, it was even found that in people who've had damage to their cerebellum, they experience ADHD-like symptoms so that's pretty impressive.
Personally, I'd rather you practised the prayerful meditations of the Catholic Saints if you were to meditate but nonetheless, I do recommend meditation and of course, do some exercise, particularly something that demands balance like running. It was commonly observed that children with ADHD did fine when they were in their football club but when the club activities ended and so the kids were just laying about indoors all day, that's when the problems ramped up.
With that, I now present the so-called "3 Ms of ADHD:" Meditation, Medication and Movement. I think this book could be a big help so you should get it if you can.