Almost constant lower right abdomen pain with back pain

19F, I’ve been having really heavy periods since I’ve had my puberty at 11 years old. Always very painful periods that affect how I live (I can’t do much on my second day let’s say)

Since two months now, I’ve had almost constant lower right abdominal pain along side other symptoms like painful bowel mouvements, back pain and bloating. I’m constipated due to iron supplements but it’s usually not that bad.

I’ve had an X ray, abdominal ultrasound and CT scan that found absolutely nothing. The doctors almost laugh at my face when I explain them my symptoms.

I was wondering if anyone had similar symptoms of endo… because I have no idea what I got.