HI
My son started various similar things at around 3. Acting like his shirt was bothering him, etc. Later things became more like "classic" tics (eye blinking/head jerking/etc). He is now 7. This past Sept he had a very bad month. The freat news is that he turned out to have sensitivities so a few things such as orange, red grapse, flaxseed oil, and more (11 items some foods some chemicals). Once we got him off the flaxseed oil suppkement I started him on in August, and all the other things, his life has changed. He is almost tic free and very serene, not at times agitated like he was before. I definitely recommend getting him tested mabe in a couple of years 9it involves drawing blood).
Good luck!