My daughter is two years old and wakes up at night every 30 minutes to an hour. I don't know what is wrong every time she wakes up she screams as if she were dying or something. What should I do? What's wrong with her? It is really scaring me cause it has been going on for a month now and it keeps on getting worse

Has she been to the doctor recently to rule out any medical conditions? I would do that first.

Also, this is a common age for night terrors to begin. What is her bedtime ritual like?

Look for the symptoms described here:

Childhood Sleep Apnea