M.R.
Yes, I have ADD.
I was finally diagnosed in my late 40's.
I do have an Rx for Adderall, but I rarely use it. Because I have 'co-morbid' issues. My ADD became worse after a TBI (Traumatic Brain Injury). The meds are fantastic, but conflict with my other brain functionings. For instance, I MUST take a 20 minute nap in the afternoon without any sound or light to let my brain rest, but the meds keep me very alert, so then I don't get a healing nap, then I crash....then the day is all down hill from there. So until my brain heals more, I've taken a hiatus from the meds. Honestly, I am a much nicer person on meds.
I also find that one cup of coffee, and only 1 per day, after a healthy meal is a close 2nd to Adderall. Too much caffeine and my eye lids quiver.
I avoid white sugar and white flour like the plague. I don't eat processed foods and I drink a lot of tea.
I have to keep my environment noise waaaay down or I will get absolutely nothing done. I'm easily distracted by certain types of noises, and then not bothered by some others.
I can hyper-focus at the piano.
I have tried other methods. But what works for me will probably be different than what works for you. I tend to have sensory integration issues. Once you figure out what in your environment and head that keep you distracted, you can start to eliminate those and practice focusing for longer periods.
I also think those of us with ADD are super creative. So I'm not bothered by my mind. It might bother my husband, but not me.