E.M.
C.,
I know very little about this but I am responding because you have a weekend to go through before you can see her doctor.
Twenty five years ago I babysat a child about 6 months with the same behavior. They hadn't told me about this so needless to say I was terrified when he woke up screaming and nothing seemed to calm him down. I called my mother,(we lived in the neighborhood), and she came over to help me rock, sing and gently dance with him until he finally relaxed and fell back to sleep. I realized after my mom came over that when he first started screaming he really wasn't awake. He was actually still in his night terror. I remember having to lovingly try to wake him up before we could try to calm him down. You say that your daughter "wakes up at midnight". You might want to make sure that she is actually awake.
I actually have no more info. to give you as I was very young and my mom is no longer living for me to check with her.
It sounds like to me that you might be dealing with "night terrors" and I agree with your other response to look up as much information on the internet. There might even be a support group online. I wish you the best.
Have your husband and you become a team on this instance as it is exhausting and unnerving going through a terror. If your husband is not there at this time, contact a friend or family member to stay with you especially through this weekend.
Maybe go to your neighbors and explain what you are dealing with. I know if I knew that a parent was lovingly trying to quiet the child I was hearing scream, it would make a difference in my patience level. I know from living with thin walls and three little one, it can be frustrating. A word to the wise, check your frustration level when dealing with the screams and make sure your thoughts are only on calming your daughter down and not on worrying about your neighbors.
Deep slow breaths,
Evelyn