My son has been on Concerta for a couple years. We recently started Clonidine to help him get a good nights sleep since he has to get up so early for school.
We have been very pleased so far with the Clonidine and I think we could back down his Concerta because he is much calmer with enough sleep.
Please do not stop clonidine suddenly ... it needs to be tapered because of blood pressure effects.
The combo has been proven safe and effective by the Tourette Syndrome Study Group ... has your son been evaluated for OCD ??
Maybe the dose of Concerta needs to be lowered a bit since they added a new med along with it. My daughter used to take 30mg of Adderall XR and they tried strattera alone, the Strattera didn't help with concentration but did better with the hyper than the Adderall did, so she is on a low dose of both, mixed together they work great, but you have to find the right amount.
My daughter takes 36 mg of Concerta and 0.1 of clonidine to help her sleep at night. She hasn't had any side of effects with this combo and has been on both of them together since early April. I would stop giving the clonidine altogether since he didn't start this behavior before taking it, at least until the next doctor appt. My daughter had many meds before Concerta and if any of them made her out of control (in a sense) I immediately stopped administrating them to her until I could see the doctor. I feel that it's best to do that. I hope things get better for you and your son. I hate to see children suffering, especially through the early years. It's hard enough to be a kid. :-)