How do I leave him??

Hillary
My son is 5 weeks 1 day. I always planned on going back to work after 12 weeks- partly because I want to and partly because I don't have much of a choice. But lately he's been so colicy and the pediatrician just prescribed meds for acid reflux. Now lately the idea of leaving him to to back to work is getting harder and harder to cope with. Not to mention I've been struggling with PPD. I just feel so hopeless and helpless and it seems like no one gets it.