Is this really normal?!

So I've been told this is normal for PMDD but I've never actually talked about it with anyone that has PMDD. So basically 2 weeks out of the month I'm "normal" and the other 2 weeks, it's almost POTS like symptoms. (I say that because my dr almost diagnosed me with POTS but said it was likely PMDD instead since my HR doesn't get that high) Like for example When my period starts my HR drops. Im sitting up right now typing this and its 62, when I sleep it'll go down to around low 50s. Getting up out of bed, doing housework, walking, my HR barely hits 120. Now in two weeks it'll just steady start getting worse. Sitting up it'll be 80s laying down 60s. Getting out of bed to go to the bathroom itll be 120s. Housework im pushing 130/140. Its so rough. It makes doing anything almost impossible. And also makes my anxiety worse...