Try Ginko Biloba (natural herbal product) that you can get at your local pharmacy or natural foods store. It's not addictive. And it has been shown to help some people with concentration and memory problems; so that the symptoms are more manageable. The patient demographic for Ginko is usually old men and women. But, I don't see why it can't help any one else with the same symptoms. I have bought a bottle of capsules myself and plan on taking three pills a day; while note-taking any improvements.
Yes there are many natural altenatives out there to help you, the health food stores have something in called Vaxa Attend, and I think that is has had good reports, it has also been shown that Food supplement treatment of ADHD may be of equal effiacy to Ritalin, you would benefit from a multiple vitamin-mineral supplement with B Compex and Vit C ,Fish oil has also worked well for some.I have a terrific health store called "Sprouts" and they even have technicians who will go onto their PC in the store and print out details of relevant supplements to help you, I take some myself for Adrenal Insufficiency and they do work.
Thre are natural things you can take and do to subside the symptoms. I hust learned that if you cut out all yellow food dye in your diet, it may help. Good luck!