This may be the same in the US as it is in Canada, under the same circumstances. If someone is living with you and is NOT paying you rent, you can ask them to leave, the... same.... day.... It all comes down to money. If that person refuses to leave, you call the police and they will come to reiterate to that person the request you have made to them and suggest they begin packing up immediately. If an officer came to a home for this reason and saw the physical and emotional condition of your friend they would call an ambulance and this would be out of your hands completely. And he couldn't come back, he would be told that by the police such and he would be charged if he attempted to and once again that would be out of your hands.
I sincerely hope you are alright Faithfully as you haven't posted lately. All of this may seem utterly normal to you, but I can assure you, it is not.
Please post if you can and let us all know that you are Okay.
G