When I'm feeling down, I pick up my copy of The Book of Awesome, by Neil Pasricha. The book contains one- to two-page entries from Neil's blog, 1000 Awesome Things.
It's an easy read, and makes you appreciate the little things in life that really are wonderful.
I agree with jgnat - I see signs of severe depression and suicidal ideation in your posts. This should not be ignored. You need to get to a doctor as soon as possible and if your doc can't help you with counselling, ask them to refer you to someone.
It may take some time getting in to a specialist. Check whether your employer offers an Employee Assistance Program. These are usually free of charge, you can get attended to quickly and you can maximize your sessions by taking advantage of in-person, online, and telephone counselling.
Whatever you do, don't lose hope. Your family needs you. Your husband and your daughter needs you. We need you.