I never really used to experience pms but since I had dd3 it's been terrible. It took me quite a while to realise that how I was feeling seemed to be linked to my periods.
The week or more leading up to my period is awful. My anxiety (mainly health anxiety) feels out of control and it makes me into an awful person. My thoughts are constantly spiraling. Then the week of my period I feel a bit calmer and alot more rational but totally rattled and shaky, like the come down from an adrenalin rush. I have about a week of feeling "normal" before it all starts again. I feel exhausted by it.