I hear you about difficulty waiting for medication to work! We tried Daytrana (patch) for DS and it took 2 - 4 hours to start working. Mornings were awful! I managed a week before giving up on it.

When I was on ADHD meds, food was not going to happen, but I could get liquid calories. Will he drink something calorie-dense like a high-fat chocolate milk?

I'm sorry you're dealing with this. Parenting an ADHDer is difficult. I wish I could enjoy being a parent more.