I hope I'm not too late and that our friend here will read this.
I've been there and the honest truth is things still suck in a lot of ways. But that doesn't really matter because it just means there's more for me to fix, more to work on and a chance to change the things that are worth changing. The people who are content with how things are never make things happen. Go change the world, make it the sort of place you want it to be.
But if you really want to stop feeling dead inside, to come alive again you need to start serving others, do some service, start caring about them, do things for them because you care, start small with random acts of kindness or volunteer at a soup kitchen or something. You might not think doing service would do much, but it will 180 your outlook on life, and as you start to care about those you serve many of them will care about you as well. Other than that exercise will help a lot, changes in diet as well and if you think there might be a need to see a psychiatrist then please do, in fact I think you should. But whatever course(s) of action you decide try to stay away from the ones that can't be undone (death is rather permanent).
if you need someone to talk to I can give you my contact info and we can get through this, just let me know ok.