M.J.
Please talk over treatment with a specialist. There are no natural "remedies" for ADHD with any science showing they work for this condition. Omega 3s have shown promise with attention, but they tend to be used in conjunction with ADHD medication.
Join CHADD and read ADDitude magazine to keep up on the latest research.
There are a lot of scams and strategies that will waste both your time and money. This is a brain disorder and not something any food, vitamin or detoxing will correct. You need to talk to medical specialists for the best advice, not the misinformed general public or minimum wage clerks at health food stores selling unregulated products.
Be careful with using caffeine as a substitute for medication. It's a good temporary fix until you can meet with a specialist, but caffeine is addictive (unlike the real ADHD medications). The last thing you want is to deal with caffeine withdrawl problems (and I speak from going through this myself after giving up coffee ... it's NOT fun).
And don't be afraid one bit of ADHD medications. They can be tremendously helpful, with life-changing benefits. We've seen it first-hand with our own son.