My son David chews on his clothing, his blankets, his toes nails, his finger nails. He is doing it more and more these days. All hos shirts are chewed rough and full of holes. If he didn't only have 3 weeks left of school I'd have to buy new school shirts. Is this sensory? I'm at a loss for words. What can I do about it? Any advise or anyone else's kids having these issues?