Thanks so much, everyone. I can tell this is a very supportive place!

That is great!
He does do some type of lip smacking but not necessaily while walking around. I've seen him doing that while sitting down lots of times. This started a little over a week ago, along with the vocal tic and blinking (blinking returned, the others were new). I don't *think* that he gets tired. I think what the neuro suspects is the absence seizures, because she noted him staring off blankly in the office and when she called him, he didn't respond right away. I've seen him to that as well but he is only 4 and does seem a little spacy at times so I didn't think much of it.
I'm really on the fence about what it is.. seems like it could be the petit mal, but that doesn't really explain the vocal tic, does it? Unless he had both
Thanks for all the help!