Finally going no contact - feeling a lot of guilt

Long story short, after 30 years of abuse, I’ve had it. The saddest part is that my siblings are not understanding of me, and have made it a point to justify our narcissistic mom, despite me having to suffer the worst treatment.

I’m in mourning, and haven’t been able to properly eat or sleep in several days. Does anyone have any advice? I think this is the best decision for my own well being, but it really hurts to keep confirming that my family has never had my back.