I might be able to offer some help.
I was diagnosed as "hyperactive" when I was younger, and I am now convinced that I suffer from attention deficit disorder too. I haven't had that diagnosis confirmed, as I don't know who to even ask about it. But I've been searching for solutions for years. I tried meditation, but my mind wandered too much. I tried reading books on the subject, but I've always had trouble taking anything in from reading. The audio programs I listened to offered nothing, except lots of case studies and no solution. It can be a right pain as a student too as it takes me forever to read what I need, I miss a lot of important stuff during lectures and it takes me forever to write an essay.
Well, for the last month I have been working on speed reading and exercising my peripheral vision. I've never heard of it being used as a solution to ADHD, but to my surprise, my mind is stiller and more focused than it has ever been! I'm reading books on a daily basis, within a matter of hours and without distraction.
First of all, try this exercise...
* Stare at a single point on the wall and don't move your eyes.
* Without moving your eyes from the point, try to "see" anything to your right, then left, then above, then below. It won't be in focus, but you should have an awareness of anything there.
* Repeat 3 times.
* Now do the same thing in a clockwise motion, becoming aware of things surrounding your focus.
* Repeat and try the same anti-clockwise.
* You are now aware of your peripheral vision, so at certain points during the day, tune into your periphery. As you are walking somewhere, instead of focusing on what is in front of you, concentrate on what is in your peripheral vision.
With practice, you should find this helps calm the chaos in your head. It's also very useful for speed reading, and apparently that's the only effective way for ADHD and dyslexia sufferers to read.
Other tips I'll offer is to cut down on caffeine, nicotine and any stimulants as much as possible. Get into a good sleeping pattern. Cut down on pastry, bread and stodgy food, as digestion tends to deprives the brain of blood/oxygen. Also, try taking omega oil on a regular basis. These things help considerably!
Hope this helps!