Ds has general anxiety, and possible OCD and Tourettes. He is 5 right now and has had transitory tics since age 2.5. One of his new "tics" is arm and hand flapping. He does this A LOT. When he is excited, happy, nervous, upset, etc. It seems like he does it more than a tic, and as a way to calm and self regulate. Is this really a stim? His last tic before this was squinting at lights. Was that a stim or a tic? Is there a difference and what is the difference?