I thought this video explaining PMDD symptoms and treatments was informative and easy to understand:
https://www.youtube.com/watch?v=6eToeyIls94&ab_channel=Dr.TraceyMarks
Here's a resource I found recently:
Her Mood Mentor
She offers a free symptom mapping kit on her website, a supplement directory, and a course available for purchase.
Her Mood Mentor Website
Her Mood Mentor Instagram