V.M.
My daughter had night terrors and when I asked my pediatrician if there was anything I could do she said to put her to bed and then about 15 mins. after she falls asleep wake her up but only enough that she acknowledges you. It was 100% effective. This pediatrician had an effective solution for EVERYTHING I asked of her. She was incredibly knowledgeable.
I know how horrible it is to watch your kid in such terror and not being able to do anything about it so I hope this works for you as well as it did for us.