Being sad

I’m struggling a lot with my emotions lately. I just can’t seem to get over this sadness and feeling like I’m alone, I’m no long with the person I chose to have a baby with and it’s effecting me a lot harder than I though as I really feel like I need him, or anybody right now. I just feel hopeless. Like it’s just me and nobody understands. It’s like the kind of sadness that radiates from your heart not that kind you mentally can turn off. Does anybody know how severely this will effect my baby?