DS rubs and scratches his head/ears SUPER aggressively when he's fussy or tired. His tell when he's about to melt down is seeing the left arm go up and start rubbing. Sometimes, he settles easily but other times the scratching becomes more and more violent. I file his nails daily and he still has little cuts all over his head. It makes me worried that something is wrong?? Dr said it could be self soothing but didn't see it in action. Anyone else have experience with this? Normal or should I get it checked out?