Early Maternity Leave boredom/depression

I'm 29 +4 and I took my maternity leave starting at 26 weeks. Things were going downhill at my job and then my stepson was going to be out of school for summer so it just made sense to stop working. I've been home for about 3 weeks now and I am so bored that I'm getting depressed. I have a good sized to-do list that I've made good progress on but the past few days I can't seem to be productive. I feel myself sinking into a depression. I'm eating unhealthy and can't get myself motivated to work out. It's my stepsons first week home but there's just not much to do with him either. I feel like I have no purpose and no friends. How do I feel better and pull myself out of this?