Hm. This is very interesting. First, so, IF this only happens when you have your cycle and IF you can control it with the food ways you've been doing so, why treat it as anxiety with medication? For real. You are managing it. I'm not anti anxiety/mental health medication by any means but if you can do something else, why wouldn't you just be encouraged to do that?! Our hormones control a lot of things. If you stay on top of it so you KNOW that you may feel bad like this during your period, what about just mindfully taking care of it with the food ways you have been? Thyroid is related to hormones. And likely, you'd have more symptoms than just during your period. Blood work would show that. I'm older than you and I will tell you that I get three full days of unrelenting anxiety before my period now and my doctor said it is my hormones triggering it. It's like clock work. I also get mega insomnia then too. Since I know it is coming, I plan for it and don't get anxious that it is going to happen. Feels bad but then it's over. I can deal with it. If I couldn't? then maybe I'd need medication. When is the last physical you've had? they can rule out prediabetes with blood work, thyroid with blood work and get an accurate read on your hormones. That would be a good help. But I'm with you. From what you've written, anxiety meds seem overkill.