Vyvanse helps my son so much. He's currently on 40 mg daily plus Zoloft. He's tried concerta and adderal and the Vyvanse is definitely the best of those three. He's never complained of the stomach aches he had from the others and the Adderal seemed to increase his "tic" behaviors. Problem is, he is SO THIN. Like losing weight like crazy. Anyone feel this? Any suggestions? What dosages are your kids taking if they're on this medicatiOn?