Hi H.,
Not sure where you live, but there is a place in Chester (Delaware County) that does brain scans to prove ADHD. It's unconventional and many insurance companies don't cover it yet, but for a lot of parents who are concerned with such a serious diagnosis via a bunch of checklists, having a brain test like this is reassuring. I'm a former special ed teacher with a PASSION for ADHD and have learned that there are so many symptoms that present themselves like ADHD when in fact it is something else. Have blood tests run to test nickel levels and sugars (pre-diabetes manifests itself the same way ADHD looks). Omega-3 Fish Oil is a natural attention booster, which most kids with ADHD tend to crave tuna fish since the body is naturally craving the chemicals to help focus the brain. I have a bunch of non-medication suggestions as well. I always explained to my students and their parents that a brain with ADHD is like a train track with 2 trains traveling on the same track at the same time, it's impossible. The brain is meant to have one hemisphere work at a time. If both sides are trying to communicate to the person then you see ADHD symptoms. So, you have to occupy the one side so the other can do its job. Things like velcro stuck to the bottom of a students desk or a poker chip in their sweatshirt pocket or a cotton ball taped to their pencil side really help. While one hand rubs these multi-texture objects, the other side is able to focus. Finally, stay away from red/orange dye (such as in Doritos) as this has been proven to have adverse effects on people with ADHD.
Hope this was helpful. The medications really can work, but there's a lot of trial and error. Make sure the school is aware of when medications are started, stopped, etc and get feedback. Many suppress appetite, cause students to seem like zombi's, etc. These can have adverse effects socially on the student... which is just as terrible as being "the hyper kid" in my opinion.
Best of luck to your godson!!!
M.