How do I get diagnosed

I believe i have PMDD. I dont currently have a PCP. Would my gyno be a start for getting diagnosed??? Ive been dealing with it for years but the mood swing and absolute depression and out of control feeling is getting so bad. My therapist i was talking to for a bit even suggested i look into this, she really felt i had it. Any suggestions or natural remedy helps would be welcome. I hate the idea of being medicated. I was on zoloft for a bit and felt too much like an unfeeling zombie.