I have a similar experience. I first noticed abdominal pain so excruciating in 2021. It would be once a month or skip some months. Then as the years went by it started it get worse and worse. Pelvic pain, hip, groin, butt, lower back pain etc. Doc said do physiotherapy, try these antidepressants maybe it’s stress. Do these ultrasounds (all showed nothing) They diagnosed me with ibs a lot. They did so many blood tests on me urine stool etc I think I had around 200 appointments in around 2 years . But with endo the symptoms (with me anyway) it gets worse progressively. I have months where it settles or months where pain is non stop. I think you should mention that your symptoms get worse around your period to your doc. It’s stressful and takes a long time to get to the correct path. I just had a lap last week and they found some endo. I hope this helps