I think I'm slipping into depression... my baby is still in the nicu and he's now 2 weeks. I can't…

I think I'm slipping into depression... my baby is still in the nicu and he's now 2 weeks. I can't be with him but just for a few hrs a day bc i have my three yr old and she's just not able to handle being up there all day.. (of course, expected.. she's 3 lol) but it just gets harder every day when I leave him I just cry and cry and my husband,God love him, but he just don't understand why I get so upset... i just want my baby home.