I was told by the midwife that they work in 100% of cases. Mind you, at this stage I was 8cm, 13 hours of a back labour, hadn't slept for over 24 hours and had had no drugs. I was pretty much delirious and screaming in pain constantly as it was a constant contraction.

After they ddin't work, I had gas. I passed out from the pain a few times toward the end, I truly wish those needles worked, but all they did was give me quite a bit more pain and I was left with bruising in my back where all four needles went.