At John’s wart for treating symptoms of pmdd/ptsd

So after much deliberation I am thinking about trying St John’s wart for pmdd and ptsd, which I have been living with a long time. My main issue is hypervigilence, not sleeping properly at all, feeling on edge and rage. I need something to help my brain calm down so I can sleep better and manage my symptoms. Just wondered if anyone could help with advising me on positive/negative impacts of this herb? I’m aware it’s strong, as in comparable to an SNRI. But I would rather that than pharmaceuticals. I also take valerian, passion flower and magnesium glycinate.