How can I help my relationship?

I'm going through a lot at home (no dad mom and sister got into a fight and kicked her out plus more) and I can't be sexual or intimate with my boyfriend and I feel like shit but I just can't handle it even kisses make me feel overwhelmed. I've tried to not let it seep in but it seems to be and it seems to be going from bad to worse. First it was yelling but I stopped that after the first time and today it was outburst and I think it's just time to go silent but then I'm lacking communication but regardless of how I try to communicate it ends in me snapping or pushing him away telling him not to worry. I just really don't know what to do now
How can I help my relationship?
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