Re: Scared to death (long)
I second the "tell the nurses your medical history" stuff... they don't always have time to read the charts, especially in an emergency. Or, the doctor has the chart and the nurse is the one actually doing stuff to you.
Also, many women have depression and other mental disorders during pregnancy and take medication to help with that. Talk to your doctor. He/she may refer you to a psychiatrist for a consult, but your OB will monitor your medication, too. Sometimes the oral pain medication they can give you during labor can also help relax you and calm you down.
Finally, you might want to consider some calming therapies of your own, like bringing lavendar scents and soothing music with you to the labor room.