We did heavy mental test last month, and fund out that arsenic is really high in his body. naturopathy doctor put him on a very safe heavy mental detox remedy. In the beginning, he showed a bit regression on emotional control. After couple weeks, he is doing much better.
Few occasions he was really upset, but he did not get angry or throw tantrum. Once, he had tears in his eyes, but he was able to control it.
At school yard, he is able to talk to his friends in a very calm way. At that moment, LG felt he is a perfect normal five year old boy.

Other suggestion is to cut down process food as much as possible. We switched to fruit sugar and sea salt. Try to buy food with nature sugar and salt.

Correction: He was diagnosed in Jan, 2010