First, the car:
If you hadn't already bought the car, I think you'd hear a resounding, "DON'T DO IT", but it's too late for that.
On the plus side, it's a decent car. Good mileage, should last you a while. On the negative side, how could you possibly have paid so much for it? I see from Google that it runs $16,692 - $24,062. Yeah, leather seats, etc.; I'm thinking you bought a tricked-out version of an economy car. Or did you roll an old car payment into the loan?
You'll get different opinions on this, but I say keep the car. Keep the car a long, long time. You have to pay for it anyway, so use it. As others have said, mind your maintenance so it will last.
House:
Your utilities look high to me, but I do live in the land of low . . . everything. Could you cut back on utilities by keeping the heat lower, caulking windows, etc.? You're spending $100 a month on furnishing your house -- that's not something you can afford right now. If you're surviving with what you have now, you can continue surviving with that same stuff for a while.
Multiple categories in your budget: fun, eating out, vacation, entertainment. Yeah, we all need some of that in our budgets, but you're fooling yourself by moving things into multiple categories so that it looks like less.
Moving in with mom:
I'm ambivalent about this one. So many variables: How do the two of you get along? How far from work is she? Would this be long-term or short-term? Would your house sell quickly and for a profit? Would you actually save money doing this, or would you want to escape often enough that you'd just "up" your entertainment budget?
If you stay put, a roommate is a great idea. A roommate could potentially cut your mortgage in half, and that's like free money.