Wow sorry to hear about it Tom, you will get through it.. ALthough you might want to see a specialist and get a second opinion. A lot of cases where children are diagnosed with ADHD, their problem isn't ADHD, but undetected food allergies, often to food dyes, preservatives and other alergens... The alergic reaction is almost identical and pretty much indistinguishable from ADHD. My daughter has allergies to Red food coloring, and when she eats it, she's mental for 3 days. Make sure to rule out those allergies before you allow them to medicate your child, because if all it takes is a simple diet change, it can save you years of grief.
Good luck man.