This LIVIA sounds like total BS to me.
I had horrific first day period pain for years. I wasn’t willing to take drugs for years. Eventually, I took 600 mg Ibuprofen and it worked great! It takes about 50 minutes to kick in, so you have to try to stay ahead of the pain if your pain is very bad. 600 mg every six hours. Take with a full glass of water and a little food or a whole meal (can be a cracker) to protect your stomach.
Naproxen works similarly, but a different dose and different timing.
You might try ibuprofen if the Naproxen hasn’t been very effective. Another option is Ibuprofen plus Tylenol.
Check with your doctor obviously.
Is your pain throughout the entire time of your period or just the first day or two?
Have they done any diagnostic tests? A lot of the tests don’t show endometriosis, which is likely the problem, but it could just be your cervix opening. Young women often have very bad period cramps because we have very small cervical openings and opening the cervix is painful, also the uterus contracting, just like a labor pain. The difference with labor is the pain comes and goes, but flipping periods it is constant.
An ultrasound would show fibroids, but likely you would have pain all month if you had fibroids pressing on something.