I too have felt like that, but I have 3 great kids and I go on because of them. It's been up and down for me, but I am here. If I didn't have the kids, I'm not sure where I would be. So, my point is, do you have something, someone, anything that you can grab onto, for some more strength to get over that hill of saddness..easier said than done, I know, but please think really hard for a while.
i have felt ike that a lot over the last few months, medication helped.