Last time she did this it went on for six months and it destroyed me.
Can you tell us what happened last time?
It's normal to feel overwhelmed and scared. I'm so glad you learned about BPD. It sounds like it's helping you understand some of what's happening and that's great.
Take good care of yourself while you're navigating these intense feelings. Sleep, eat something nutritious and get 10 minutes of sun each day. You're going to be ok, and so will your friend. Big hugs.