I don't have any experience with medicine but wanted to say that if you're seeing the behavior and you think that there might be something else going on you can always get a few opinions from doctors. I'd be leery about just trusting what the school is telling you but now you have your DS telling you things and you're with him more to observe his behaviors.
I know that in my case the schools were pushing me to put DS on medicine but I didn't see the ADD behaviors at home and after getting a few opinions I'm fairly certain that he doesn't have ADD at all. If I did see the behaviors that they were mentioning I'd probably be getting a 4th opinion

You have to trust your instincts as a mom. You know your kid the best!