Fortunately mine have been much more civilised since having children. (My uterus being stretched to the size of a swiss ball probably means that it can't clench so hard again! 😆 )
I remember being well into my 2 hour pushing stage and suddenly being more lucid when the pethadine wore off, feeling on fire from my ribs to my knees and getting flashbacks of certain periods! I would actually take DS2's 10 hour back to back labour over certain periods as at least it was shortee, and didn't involve trying ti blunder on as normal.
I had a prescription of mefanamic acid, but my periods were very irregular so I had no clue of when I was due, not which week, nor which month, so suddenly I'd get the pains, it arrived and there was no time to get pain relief into my system and I'd just be overwhelmed rapidly in a curling up on the floor at school or work type of overwhelmed.
It's hard when that is your normal from the start. Having them fairly civilised now, on a "bad" month I take a round or two of ibuprofen and then carry on as near normal, it still surprises me how different it was from that level of pain that consumed me.
It is wrong that women are expected to just accept a significant chunk of their life is rendered unfunctional as being normal.