Goodness,
I reach out for you. I'm so srry you are suffering from these frightening episodes that you do't have control over.

If anyone in my family had those risks, I'd big them NOT to leave the house, and encourage to really takecare of yourself and spend more time even together. So sorry your family has not been supportive, especially your sister. But your sister is likely at that young adult ready-to-leave-for-college age.

I would recommend that you see a psychiatrist/psychologist. And he/she can also refer you to a family therapist, which I woudl highly recommend. Maybe your psyche can even call the house to ask your family to attend rather than YOU having to request, which they may immediately decline to doing. But through a therapist is wen people can express themselves more cleanly, and the threapist can encourage and give ideas on how to give better support and love.

Wishing you luck!
Hana