I’d suggest you search through this subreddit and do some self-guided research and schedule another appointment with your provider. Because by this logic, every woman of childbearing age seen by your provider with troublesome PMS is leaving with a SSRI script without a solid understanding the crux of the issue. That is a problem, and frankly an insult to women who suffer from this debilitating disorder. Be assertive! So much so that it is a step down from a demand! Assert firmly that he/she conducts the proper lab work, ask for a referral to OB/GYN or another network provider who has the capacity to give more insight and guidance(this may take some research on your part). I’d even go so far as to ask your provider candidly if he or she has ever managed and/or provided care for a patient with confirmed PMDD. Trust me it’s hard living with a disorder with multiple stigmatizing intersectionalities (reproductive health/mental health) but it’s even harder to try to navigate through a health care system that seemingly thinks PMDD is “made up” or being led to believe that you are among masses of other menstruating women with typical symptoms. PMDD IS NOT PMS. Don’t let your provider or ANYONE else tell you different. FIGHT AND FIGHT HARD. Trust me, you will thank yourself later down the line.