Need some advice.

So i’m in some complicated situation. I was a stay home mom for almost two years. But during that time I was mostly depressed because I was feeling lonely all the time. my husband works 6 days a week for 12 hours everyday. so most of the time I’m alone with the kids. but recently I started a part time job. but most of my money goes to daycare. So basically I’m working for somebody to watch my kids during the week. doesn’t make sense. even if I wanted to work full-time we can afford paid daycare. so I know I have to leave my job but is so hard for me. I don’t want to be depressed again and be alone all the time. I had the feeling of not been useful. Please I need some advice what to do.