Hi Mazrim

Definitely take a B-vitamin complex, vitamin B12 particularly,you can also try Lecithin(1 gram or more per day) which converts to Choline in the body or brain, which is a precursor of the Acetylcholine neurotransmitter, it helps with mental alertness and memory. Acetylcholine is one of the main things believed to be involved with Alzheimers, but not only, obviously, and can help improve anybody's state of mind. Ginseng and Ginkgo Biloba are excellent choices. One research report said proof readers took Ginseng and could sustain much longer periods of concentration than those who did not.

What does coffee do for you? I've read quite a bit on coffee and it helped for memory tasks in older adults in one lot of research, apparently it's okay if you do not exceed 3-4 cups per day. There are many positive things about coffee which some people shrug off.

You might also want to try "Kali Phos", it's a biochemic tissue salt, homeopathic. It helps with fatigue and is used to treat students who suffer burnout after long periods of study.

A supplement of Amino-Acids will also help as they are the precursors for neurotransmitters in the brain.

I hope this helps, but try them at your own risk as I do not know the possible problems with ADD. I'm merely talking about what has helped my abilities and that I've read that helps state of mind.

Persevere with finding resources and solutions for your own benefit, you'll reap rewards outside of the problem area too.
Good Luck, Go Well.