Ready I was terrified before I had dd1. It's the unknown quantity that is so scary.
How much will it hurt? How much can I take? What will it feel like?
Everyone is different though. For me, it was a slow build of pain, that got intense about an hour before I started pushing. Until that hour, I felt very in control and was able to deal with the pain. When it got really intense, I started to panic. Luckily, I had a great midwife who got my attention and helped me not to succumb top the fear/panic.
It's very important to not let the panic take over. My midwife was stern and that snapped me back into focusing on what I was doing, e.g. Controlling my breath.
Controlling my breathing was how I kept the panic at bay. It made me feel in charge.
Think about who you are and how you deal with fear/handle pain. If you know that something works for you, then focus on doing that while you are in labour. I had always loved yoga, so I concentrated on breathing like I would when I was doing yoga and it really worked for me.
And take the drugs if you want them.
Good luck.