I'm sorry to hear that your friend is going through utter hell from the one who is supposed to love her above all else...it's not fair, it's just not right!

I'm afraid, though, that you need to try and take care of yourself. Worry and anxiety are such major contributors to depression, and so is sleeplessness. You've got to take care of yourself if you want to be able to help your friend.

I hope things get better for you both--be safe, and get better!

~Hugs~
DJ