P.M.
The epidural breaks the sterility of the spinal cord nerve space. If that gets infected you are in big trouble. Sometime air bubbles can enter the 100% closed system, many times women have lasting life long migraine issue from epidurals - I know I am one of them. Complications are more common than most would think - they just aren't as prevalent because Drs make it seem like it was something else as the cause or a pre-existing issue you'd not noticed before.
Labor pain isn't that bad when you are able to move around, keep up your strength with food and drink, take a dip in warm water or take a hot shower. Maybe you need a new birthing experience if you feel you will need an epi every time you labor. Try a Midwife, you will most likely be happier and in less pain with one of them, than with a surgeon (OB).