Can I do it?

I'm 19 and recently became a single parent of two . One is 10 months and I'm due with my second in October. I'm extremely stressed with the new life change. Me and my son were kicked out of the apartment I shared with my sons father so I've recently had to move back in with my mother and we are sleeping on her couch. Not only that but my son has gone from seeing his father everyday since the day he was born to not seeing him at all. My son screams for his dada and half the time refuses to go to bed without seeing if dad (pictures of his dad put him to sleep). How do you explain to a young child is dad didn't wanna be around? You don't. All the stress of having to live with my family who constantly reminds me I'm a waste of space for believe a man really loved me has caused me to have high blood pressure , bleeding and spotting, and cramps out the ass. I feel like I can't do the whole single mother of two. I'm just so worried I ruined my kids lives by thinking their father was always going to be their. Can anyone help me ?