I went thru that with 2 boys. My x died when they were 11 and 12 - very risky age. And they went to the darkside. I have one boy that almost died at 6 mo. old and developed a slight learning disability.
So, based on all the heck I went thru, I can say this. If he is wanting to stay home more often, THAT IS GOOD! It's better for him to be influenced by you at this hormonal (depressed) stage than by the bad kids - who will accept him a lot more quickly than the "preppy" ones.
The bathing, smelling thing - at least one of mine went thru that. He is no longer like that - changed around 20 yrs.
My youngest one went to vocational school (aircraft mechanic) and regrets not going for his engineering degree.
I took mine to a psychologist for a while after their father died. I don't know if it helped, but I'm sure there were seeds planted by him that they took with them.
I know you feel fatigued, and I know the days will be hard, but you must fight this fight for him. Both of mine were arrested for drug related charges - they got caught up with all the drama and it got really bad. At least you have your husband to help.
Get out with him, do things fun, train his endorphins toward happiness. Offer him money to do things around the house, increase his selfworth. As soon as he's able, get him a part-time job so that he gets more of that sense of responsibility and reward (the manager of the establishment will really matter, so if you start hearing him complain about a critical manager - this will be bad - get him out of there).
PM me anytime. I've been thru true heartbreaking heck with this, and know MOST of the signs.
Good luck, stay strong, and discipline with much love and thought. Boys are more fragile than we women tend to think.