First of all, you are NOT worthless. If you're in an unhappy marriage, it would be best for everyone involved if you divorced or separated. Your children might be hurt for a while, but they'll recognize the importance of it in the long run. Whenever you feel depressed (which can be a lot, I know), stop, count to six, and let out a breath. If you want, you can even have your kids do it with you. Even better if it's late at night, when people tend to start getting really depressed. Make an effort to be closer to your kids; a REAL effort. Even when you feel like lying on your bathroom floor and crying your eyes out, reach out to your children. Kids have a special way of talking that drags you out of even your worst moods (no matter what age they are). It won't be a straight upshot; some days you're going to want to lay in bed and sleep all day and others you're going to want to do all sorts of stuff. Push through the bad days and remember the good ones. I even keep a journal of my happiest memories so when I'm on the edge of fast down-plunge and staying steady. Things like your first kiss, your first childbirth, that one really funny thing that happened at band camp, etc,. It will get better, I promise.