cutting clothes/chewing on clothes/speech

[cgpenn]

My seven year old son has been chewing on the collars of his clothes, and today he cut his shirt at school. He seems to be clumsy, and is constantly touching things, family members. He can't seem to leave things alone. He does have a speech problem, cannot pronounce "th", "r". We constantly have to ask him to repeat himself. Occasionally wets the bed and picks his nose. Loud noises bother him, fireworks, concerts. He is destructive with toys and doesn't care about ruining his clothes. He usually acts without thinking and gets into trouble for it. He recently broke my bedroom door because he wanted to climb on it. He does climb a lot and jumps off of things. I also have to talk to him very loudly just to get an answer out of him, it seems like he doesn't know what was just said to him a lot. I am just wondering if anyone would know why this may be happening or if I should be concerned.