I know I will catch shit for this, but...my grandson had similar issues. Smart kid, lovable 99% of the time, but when frustrated about sports/school/whatever he had what we called "melt downs". Total over reaction to the situation. He had a tendency to to get very absorbed in whatever he was doing and wouldn't take time out to eat. "Forcing" him to have a snack helped, but not completely. It was getting to the point that other kids would set him up just for the "fun" of watching him explode. We all, his parents/grandparents/etc. hated and delayed putting him on Ritalin, but once it was tried as a "last resort" it has made all the difference in the world. We are still very cautious about doses and giving him medication holidays, but the improvement in his life simply can't be denied. I was very resistant and skeptical, but the results are obvious. Start with calories, and therapy is a good idea, but also consider the stimulant medications.