I know this can be a very difficult issue, and it’s hard to hear that your child is experiencing these types of issues. My son was very
similar when he was in Kindergarten. We had him re-evaluated and it turned out that he also was had High-Functioning Autism. The outburst
he was experiencing in class was due to Sensory Overload. At this age it’s very easy to mistake ADHD with High-functioning Autism.
Also, pay attention to the foods he is eating. a lot of the dyes will cause this irritability.
I wish you and your family all the best. Do give up, there is an answer out there for you and your sweet boy is worth the trouble to