Hi MIke - it's scary to not feel in control of your emotions.
Very glad you are seeking help! By coming here and reaching out you obviously want a change. I think that is wonderful because children are vulnerable to our foibles and difficulties and have to overcome any difficulties of their childhoods as adults. No parent is perfect but I think it's great you are doing something to correct the situation!
They can read this and it may also damage your marriage.
As far as the faith thing, I think a lot of people become depressed when they lose their way in life. When you can't see why you're here it creates a crisis. The whole idle mind and devil's playground is really true when it comes to depression.
Maybe you can make a few small positive goals for yourself - go fishing with the kids, or if you're not ready for that, start smaller, like getting some exercise, or going on a hike. Sounds like you need to believe in yourself again and love yourself before you can love those around you. Think of some things you'd really like to try or haven't done in awhile. Seek out your inner child. :)
But keep trying - you and your family are worth it!
Nicky Lynn