Pethidene makes me feel stoned. I've had it in the past for endo and had a hospital admission because the pain was so bad and I felt like I was high as a kite. When I had it with my 3rd birth, I had that and the gas and I was hallucinating, but I wasn't saying anything crazy because I was internalising it all and half asleep so it was just all in my head. However it didn't feel like that with my first birth, mainly because I had it during the night before labour really established so I could sleep.