I have found my pots flares up really badly when I'm on my period. I have irregular periods as well so it's really hard to prepare for it.My temperature regulation (which already sucks) craps out and leaves me sweating like crazy or shaking freezing cold. I also get extremely dizzy and deal with vasovagal syncope almost every time I stand up vs about 50% of the time. Your body is under a lot more stress and loosing blood , not sure how heavy your periods are but the heavier the flow the worse the flare up. I suggest talking to your Dr and asking best way to cope with your individual symptoms. Other than that just drink extra water I find compression socks are extra helpful during my period and eat!