My 6th grade daughter (age 11) has both ADHD and Tourettes (along with MDD, OCD, and anxiety). She was diagnosed about a year ago. This has been a huge, painful struggle for us. She has been very difficult all her life, and after working with her via every parenting technique I'd been able to find, I was fed up. It never occurred to me that she had special issues. I thought that she was being oppositional and defiant (since by nature she is strong willed - as am I!).
For us, the depression has been the most difficult. But right around 4th grade, the ADHD really became a problem with the increased need for school concentration. She is otherwise super successful in school. But this year she started middle school, and it has gotten worse again. The changing of classes, different teachers, writing down and packing up assignments by herself, and staying focused on far more homework and assignments/projects that are due at various points in the future, is really difficult for her (and as a result, I'm going crazy). The Tourettes is difficult but manageable, especially after coming to understand it (tsa-usa.org) has a lot of info.
If your son ends up diagnosed with Tourettes, I highly recommend getting involved with a regional group. This will enable you to learn a lot about TS, share with other parents who understand, and allow your child to be around other kids with tics which can really help to make them feel normal. There looks to be an OR/WA Tourettes group, but I can't get the page to open. They could direct you to more local support groups.
I highly recommend getting actual diagnoses before you start worrying too much. But if you can manage these concerns without pursuing a dx, that's ideal. My daughter was profoundly miserable, so we really were forced to figure out the root of these things - several years of therapy had not worked. She is now on medication. It's something I never wanted to do - and don't recommend - unless your child's life is degraded without it. In the end (for us - certainly not for everyone!), the risk of having a suicidal child was far greater than any adverse effects of medication. We also have started an incredible new therapy process for the depression, that I really feel will make a big difference.
That's a little bit of my story... but believe me it took a long time to get even this far!
Good luck Mama.