We had some of the same issues with my son last year during first grade except he had a few more issues where they did diagnose him mild ADHD. He had a few sessions with a counselor and she even suggested we consider medication so we didn't jump to conclusions. We worked with the pedi, counselor, and did the AAP evaluation and all signs lead to where we are now.
We currently have him on Vyvanse, similar to Concerta in that it's a once a day, slow release medication. He is on the lowest possible dosage for Vyvanse and we saw wonderful results within the first 6 weeks (grades jumped 20 points and he went from failing some subjects to passing with flying colors). My son is now in 2nd grade and is getting A's and B's where he was struggling to pass before.
One thing we have not done is involve the schools. We do not want our son to be labeled or treated any different than the other kids. There is nothing wrong with him, he just needs a little extra help to concentrate and he is getting that with Vyvanse!
It's going to take a couple of weeks for your child's body to get adjusted to the medication. We almost went back to our doctor saying we needed to try something else because our son was too laid back but it was just his body adjusting because after a couple of weeks on the medication he was almost 100% normal but was able to focus better. One of the biggest side effects we have seen is loss of appetite. This typically occurs around lunch time when the medication is at it's peek. There are days my son will eat a ton and other days he's not very hungry around lunch. We just do our best to get him to eat something so that he maintains his energy throughout the day.
When we first started working with our pedi on this, she was very up front in telling us that not every medication works for every kid and the first dosage may not always be the right one. It's a trial and error process and should be a partnership between you and the doctor. Our pedi asked that I keep in constant communication with her for the first month regarding his progress and it was great to know that she was not just trying to tell us what we needed to do but actually wanting to partner with us to help our son be successful!!
Best of luck with this process, and don't hesitate to ask questions!!
C.