Passing out during labor

Has this ever happened to anyone? When I experience pain, my blood pressure drops and I start getting light headed. This is my fourth, and I've always gotten an epidural because I'm afraid of passing out. I really want to go natural, so I'm trying to look into all my options/scenarios.

The nurse said they would increase fluids if I got light headed and offer oxygen. I don't even know how helpful that will be 🤷‍♀️.

Anyone with insight?