Help!!!

I need help. I need some time to myself. I want to take some time off from work but I can't. We have a mortgage and a baby on the way. How will I manage? I can see where this is going. Depression, lack of concentration, I can't remember important things, I take ages to understand what people are saying and I keep making mistakes at work, coupled with time off because I can't cope. It's heading to disasterville.