Have you seen a neurologist? They can often determine if strep is to blame for the tics. But, to me, it does sound like it may be related. My daughter started have tics when she was 4. She had been sick with a flu just before her dx. But, she is now 12 and it did end up being Tourette's. I have always wondered how strep may cause all the tic disorders. The good news is that most kids with TS have a mild condition. Even more will end up only having a transient tics (short-term) or a chronic motor or vocal tic disorder. It has been very important for my daughter to get enough sleep each night in order to have less tics. Also, try to limit stress (both good and bad). My daughter usually has a bout of tics at night while in bed. One thing is for sure....they are out of our kids control and are much like a sneeze. But, for most, it ends up being a minimally invasive disorder. Here are a couple links that helped me:
Here is a link to one of the best books I read on the subject:
Best wishes to you and your son! It is so hard to adjust to a tic disorder in the beginning, but, it becomes much less significant as time goes on. Just hang in there and know you are not alone! You did not cause this and it is not a choice your son is making. It is a disorder!
Read "Saving Sammy" by Beth Alison Maloney. Her son "caught" OCD and tics from strep. The book is enlightening.