Some women feel that their minds were clouded when they used narcotics. Often, once you receive a narcotic you are confined to bed, limiting your mobility, which can hinder labor. There are also effects of these drugs on babies that are much more apparent. Pitocin, used to induce or speed labor, was once controversial in VBAC births. Many women are very apprehensive about the labor - I know I was.
Support is critical, which is where a doula comes in handy.
Most women do not truly have pelvic bones that are too small, unless you have suffered a pelvic fracture or had polio. Read about pelvimetry . Do not worry about the baby's size. The pelvis and the baby's head are not rigid structures. Both mold and change shape to allow the birth to occur.