Oh ugh Terry. What an awful day you and difficult child are having. I'm so sorry to hear this.
I don't have any answer with regards to the medications but I hope someone else will be along to give you some insight on that one.
You handled yourself so well.
When you mentioned possible withdrawal from the video games it got me wondering if maybe it really is withdrawal. That agitation, restlessness, inability to focus on anything seems like he was seeking some serious stimulation and couldn't find it. Video games are so stimulating to the brain which is why ADHD kids often get addicted to them. The images come at them faster than any other form and it really gets the brain going. Combine that with everything else and I can see why he was so agitated.
Hugs - I hope this evening and tomorrow are better.