Urgent help please *trigger warning*

My partner comes home tomorrow from being overseas for about a week. I know it hasn't been that long but I haven't eaten lately. It's been about three days. I have a history of eating disorders. And tonight I'm alone and I'm having such bad thoughts and all I want right now is to self harm (which I also have history of). My friends are asleep and won't answer their phones. Someone talk me through this please.