So much of what you have experienced resonates! Unfortunately I have a very similar experience to you.

Approximately 1-2 days post ovulation until my period begins I experience lower abdominal cramps, with regular additional lower back pain (both slightly to the left of my midline), and occasional radiating ache through my left thigh. I’ve had it for 5 years now, slowly getting more severe.

I was diagnosed with endometriosis via laparoscopic surgery, and after lesion removal I experienced no change to my pain. Post procedure I now additionally experience mild typical endometriosis symptoms.

I tracked my sleep and noticed I wake up at a regular time intervals, typically every hour (exactly). It’s exhausting getting such broken sleep for over a week each month.

I use to always described it as feeling like intense “trapped gas pain” but no digestive issues.
I have tried everything, from dietary alterations and increased water intake thinking it could be digestive, chiro/physio/massage/pelvic floor physio thinking it might be muscular or nerve related, contraception pills trialling hormonal influences, I even moved towns/homes thinking it could have environmental.

I am grateful I have found this post. I’ve never found anything that comes close to describing what I experience until now. I hope your experience changes shortly.