Hi Sinboi
Im having trouble deducing your approximate age from your writing but you mention you're still in school and drink/smoke so im guessing you're in your teens. The way your mom is treating you actually is not as bad as most JW parents. You're still living there so they wont be commanded to shun you entirely unless you leave the family home.
My advice would be to be the kindest, nicest, most helpful person you can be. This will really surprise them. They may not treat you any better at first but eventually your actions will really surprise them because they're expecting ex-JWs to be bad, drunkards, sex-mad, chain smoking, bad associations.
Be a great son to them both. Even if they treat you bad, you can at least say you're not the one in the wrong.
Yes, we care if you're alive or dead. Keep posting here. You're bound to have a load of emotions going through this, almost all of us did. It gets better i promise.