Left side of the brain symptoms and conditions

my six year old has been on Adderall xr 10mg for about two months.He gets so upset!!!!! very easy then he cries. He cries so hard sometimes he cant even breath. In school he is doing great still behind academically. He is seeing a neurologist next month to see about a learning disability until then I am very concerned about him getting so up set and crying He even said he didn't think I loved him. That just broke my heart. Before the Meds he had never been like this. As soon as as I held him he calmed right down. I also have a 9yr old that takes 15mg. He suffered a severe Brain injury this past July of 2007 The med is working well with him his Focus. He injured the frontal lobe and right and left side of the brain. If he gets upset it is a bit different too I am assuming it is more the injury I am not sure He is definitely not like my six yr old. They both do have a hard time settling down for bed time at night the DR said that was a big side affect and prescribed them both Melatonin 1 hour before bed that seems to help. s any suggestions I am open.