With all due respect: bubs here doesn't get how periods or PMS work, at all!
I just so happen to be an accidental and involuntary expert on the topic of "how much pain periods can be":
Collapsed in public and taken to hospital by ambulance a total of six times. Two out of these have included me having to yell, in utter pain, at doctors "no, I didn't collapse because I'm a drug user. I'm not an addict. I just have fucking enometrial lining and a body that seems to have determined to make it hard and painful to shed it! I DO WANT pain killers - but it's because I'm keeling over, not because I need my opiate hit here! Just give me bloody Ibuprofen, if you must and can't bring yourself to give me opiates - give me ANYTHING AT ALL!"
Only my final ambulance ride to hospital eventually concluded in a diagnosis of "severe endometriosis - patient wasn't exaggerating, but OF COURSE she was in excruciating pain all along". I was 37 at the time and had been having periods that had, occasionally, seen me pass out on the floor from pain for way over two decades! On a side note: a part of these these two decades were also spent wondering why other women seemed to get pregnant by pretty much just thinking about fertile men, and I had the hardest time ... turns out: that'll ALSO be endometriosis for you. It's all quite simple once you get that ONE doctor to believe you're genuinely in agony and investigate that one step further rather than just write you off as a patient ...
Sorry if I'm taking offense. But: NOT FUCKING SORRY, though! It feels SO VERY dismissive and belitteling to have people whose bodies are not even remotely capable of doing to them what mine has done to me yapping on about "PMS".
"PMS", in my world, boils down to "at worst, I'm irritable, and I'll tell you you're a self-indulgent arse for making such a fuss over your imagined one" [I never would, I'm quite the diplomat IRL]. - Actual periods boil down to "you make a fuss because you want validation - and I am in A&E, begging some physician to please believe me that I'm genuinely in pain and not after opiates".
Forgive me for not being THAT sorry.