My son 12 yrs took 30 mg yesterday and he said it felt like an e...

My son 12 yrs took 30 mg yesterday and he said it felt like an elephant was sitting on his chest and his chest was shaking rapidly. Later that night we had a disagreement about how the pin pong table gets put together. It turned into a full blown anger rage to the point where he went into e sezier. I was so scared and so was he. This morning he doesn't even remember anything about last night. I call ed the doc and he stopped the meds and they now want him to try concerta 30 mg. I hope this drug does not have the same reaction. I waited 7 years to start him on meds for his ADHD. I hope I am making the right decision.