Where is the silver lining?

I am 26 years old and I feel like my life is literally falling apart around me. Several years ago my mom had a nervous breakdown and has never been the same. Both of my parents went on anti-depressants. My Dad is due to drop dead of a heart attack (his father did, as did his brother in december) at any given moment. He forgets to take his blood pressure medicine (usually because he and my mom sit at the local bar and drink all day.) My grandmother has early stage alzheimers and has been threatening suicide ever since my uncle died this past winter. I lost my job in March and my relationship with my boyfriend has become abusive and destructive. I have no money so now he insists that I don't love him and I'm only using him as a 'refuge' so that I have somewhere to stay besides with my crazy parents. I don't even know where to begin picking up the pieces. I try so hard to stay positive, because someone in my family has to be, but usually I feel like I just end up shutting down emotionally and trying to avoid all the drama rather than accept it. I haven't slept well in months, whether from worrying or trying to reason with my boyfriend, etc. I guess I am just needing a little help looking on the bright side these days, and maybe some ideas towards how to pull myself (and my family) out of this m depression.