Feeling Blah

I'm 31 weeks pregnant and I'm starting to feel depressed and having a really hard time breathing. I feel overwhelmed and anxiety but don't really have a reason. This is my third baby and I'm prepared. I'm also feeling really alone I picked up my phone today and went thru my contacts and realized I have no one to call anymore, no one who cares, and most of my family have passed or I don't really know them cause they don't live here and my husband doesn't really speak much or do anything, he just makes things worse cause he doesn't understand and he never will. Anyone else feeling depressed for no reason really. I usually pick myself up and act like I don't need friends cause I have my kids but I feel so alone in this world!