Hi 123lub, I really hope everything worked out ok for you guys. That must have been kind of scary. I would like to know how things went. It will help us answer other questions like this. In particular, did he have trouble sleeping that night?
And, I am sure by now, that you have thought of this. But get two weekly pill boxes. They will have the day printed on each section. Get them in different colors. You should not have this problem again as you will then have a very visual reminder of what you have done.
For a situation like this, you should check in with the prescribing doctor for guidance. We wish you and your son the best.