Suicidal after friendship breakup?

My closest ever friend is breaking off the friendship, and it's almost definitely not salvageable. I'm feeling so suicidal right now, i just feel like there's no way i can face life unless i'm drunk, high or otherwise dead. It seems silly to get suicidal over, but i have literally nobody else now, and i'm SO hurt from how she has treated me it feels like the pain will never go away. I have depression to start with, she she just pushed me over the edge, and i'm on my second day of avoiding all liquids in an attempt to dehydrate myself to death. At the same time though i still want to live, it just seems impossible right now. Has anyone been through anything similar? thanks