PMS symptoms changing?

Has anyone else gone through something like this?

Ever since I had my son and got my first PP period, I’ve gotten what I thought was a yeast infection once a month for the last 4 months right before my period comes. It’s accompanied with headaches, diarrhea, and irritability. I’ve been treating them as yeast infections, but I had an appointment today and my OB said I don’t have an infection and it’s not rare for women to experience itchiness before and during their period. Anyone else?