11 weeks pregnant and depressed.?

I'm feeling so helpless and alone lately. i have a 9 month old son and im 11 weeks with my second. I'm a young mom and me and my Ex broke up about two weeks before i found out i was pregnant. either way i keep feeling down because my Ex had cheated on me with several other girls and i loved him so much and i found out for the first year and 9 month of our relationship he didn;t love me. it really hard on me now because i moved across the country so i'm alone and friendless i have no one to talk to. i feel so guilty about being depressed because i can;t give my son all the attention i wish i could. i don't know what i should do im stuck in a little apartment all day its on the third floor so i can;t even take my son out and go for a walk. any one have any tips or idea's? i need something to cheer me up. and saying find a bf is a no no... i can't trust anyone right now.