Dog won't stop chewing on stuff?

I have a 6 month old dog, we believe he has separation anxiety because he goes nuts when we leave the room or place him into his crate for the night, goes nuts not being around one of us period. We have been putting him in the crate since he was 3 months old for at night, so by now you would think he is used to it. Well, my husband and I work during the day. I just started work about a month ago and since I started work, he has been acting up.I leave him out of the crate because it is just not right to have a dog crate up all night and day. So, he has toys and our kitten to play with while we work. I work from 5am- 2pm, so I always come home before my husband and my husband does not leave the house until 8am so the dog is not alone for too long. However, I come home and he has chewed on anything he can find, including our furniture yet he has a whole bunch of toys and chew toys out. He goes after our things when we are gone. We literally leave nothing on the floor (except furniture obviously and his toys) and he'll chew on the end tables, the coffee table, the sofa, and even the half wall AND carpet! I don't want to get responses with people saying to leave him in the crate or to leave him outside. I can't leave him in the crate because that it too many hours cooped up from sleeping in there at night and we are not allowed to leave our dog outside in our rented neighborhood, they will charge us. So what are my options with the dog to have him stop chewing? He's costing us money to have to fix things in this place and our furniture and belongings are getting destroyed.