Sorry I meant put it in the search engine for some of your own research, and I missed that bit out!
You could ask the Doctor who prescribes him about the tic, Meds cause that and also Eye Rolling and blinking and ,can also make them more anxious ,what were his symptoms in the first place ,that were outside normal child behavior, you dont say how old he is.Why not get some further advise you want the best for him, ask what would happen if you treid without the Meds, you could also put side effects of (and put in the Med he is on)this will give you your own perception.Summers do seem long some times but if you get this sorted out there will be better ones, meanwhile keep him busy with lots of activitys.