My youngest son (14) has Aspergers but it has helped that we have known this for a long time.  If you've only recently discovered Aspergers, it could help you (and him) tremendously if you read everything you can find on it.  I'm sure you are trying to deal with the immediate problems right now though, so let me ask you, is his reluctance to leave the house an anxiety that he has had for a while, or is this something new, like maybe he's suddenly depressed?  Does he have special interests and is he engaging in them now?