entering 2nd trimester tomorrow need help with stress

I am a fulltime care giver to my mother who lives with me, (shes end stage pulmonary) I am entering my 2nd trimester tomorrow, and the live-in boyfriend dumped me today. I am already under a ton of stress, but this feels like a kick in the gut, I keep trying and seems like the more stress I learn to manage the more that keeps piling on. I did origionally look at abortion when I first found out I was pregnant, and after becoming informed knew it wasn't for me, The same as I feels like my heart will shatter at the thought of adoption, yet I feel like I am running on empty, and the baby hasn't even arrived yet. I have been able to use some coping techniques, but I am beginning to just feel overwhelmed, and confused. One part of me is done dealing with his BS, and "knows I need no-one" yet another part just wants to curls up in a corner, I am planning on raising this child on my own, but if anyone has any advice, or words of encouragement, sigh or criticism, all is welcomed, my main concern is how to stop the overwhelmed/stressed out feeling (or work thru it), and the daunting task of being pregnant, and a first time parent alone.