I definitely have a phobia of barfing and that alone gave me panic attacks whenever I would look ahead to labour. Fortunately, for me, I never actually got nauseous during labour. Yeah, it hurt A LOT, but I never even felt like throwing up.
However, I did get a MASSIVE panic attack towards the end as I got the urge to push at 8cm and was not prepared for what was meant by "urge to push". It's more like an involuntary squeezing down of your entire body and I was supposed to fight that while I had 3 nurses trying to stick things up me so they could get a blood sample from my baby's scalp. The epidural had worn off so I felt everything the nurses were doing and the pain of the contractions. I ended up needing air to calm me down along with banning the word "baby" from everybody's vocabulary as it made the urge to push even worse.
In the end I needed an EMCS and was put under due to the epidural not working. I definitely would like another CS because that "urge to push" fiasco. Just the memory of it gives me another panic attack and scares me from getting pregnant again (ignoring my fears of another miscarriage or complicated pregnancy).