Random PMS dry heaves??

So I know that nausea and vomiting are potential side effects of PMS, but the last time I had it (before today) was when I stupidly took 4 ibuprofen on a completely empty stomach. That led to an ER visit, a very unfun encounter with a needle, and a diagnosis of dismenorhea. Since then, though the cramps have been torturous, nausea and vomiting haven’t been issues. Today (three days before my projected start date mind you) I started cramping and like I always do, I reached for my trusty 500mg Tylenol pills. I took two not too long after finishing lunch but the pain continued to intensify until I found myself (mostly) dry heaving over a trash can. The pain was so bad, I was starting to wonder if it was actually my appendix; hours later, I’m reasonably sure that this is not the case. Y’know, cuz of the blood ‘n all.

But has this happened to anyone else? All of a sudden after years of consistency tossed out the window while potential symptoms start playing spin the bottle for the chance to mess with me? Just seems weird. :/ Anything would be appreciated! <3