A good 10-12 hour sobfest, followed by a few weeks of curling into a fetal position on the shower floor and sobbing until the hot water runs out as needed for maintenance. Oh, wait... that's for divorce.
Just imagine how upset you'd be if you were in a divorce.
I'm sorry, I am not good with the whole death thing. It is, well, pretty much a fact. You know the status and state of the person and they are usually not still looking and sounding like someone you love, except from the mirror dimension. That's what the evil undead and ex-wives do.
You can miss someone, but really they are still in your memory. All drugs and alcohol do is mess with that memory and your judgement. Don't try to medicate away your grief, accept it, recognize it, process it. And in the meantime, take care of yourself. You are depressed. Think of something you enjoy doing for others that they think is special, such as cooking them a meal, or taking them out to dinner (ok, I like food) or building them something. Then do it for yourself. If you can do it for others you should be able to do it for yourself. Do it. Clean some house, too. Your environment can have a big impact on your moods.