So sorry to hear about your struggle but glad you haven't thrown in the towel. Ditto Sunna's suggestion re joining a support group. Having face to face interaction may really help you get over this hump. With regards to your sister and family, sometimes families don't understand the nature of the illness, they don't know how to cope with it, so they get frustrated. It's unfortunate that your sister reacted that way and I know it hurts, but forgive them all and keep looking for the kind of support that will help you get well.

Big hugs friend