My son had had bad tics while taking stimulants (particularly Adderall, but his tics actually started on Concerta). If your difficult child's tics are so debilitating that he's barely functioning, in your shoes I'd consider a trial without Concerta to see if the tics resolve (it also sounds as if the Concerta may have stirred up some Obsessive Compulsive Disorder (OCD) behavior). If the symptoms improve off the stimulant, you'll know the Concerta is responsible. To my way of thinking, I'd rather have an inattentive, hyperactive kid than one who can't function very well at all.
Sending positive thoughts and hugs your way.
