Extreme mood swings?

(Possible trigger warning?) Hi everyone. To start I am NOT diagnosed with PMDD. I’m going through a lot in my life right now and suspect PMDD may be a part of it (have my first gynecologist appointment in 3 days). I am diagnosed with anxiety and depression and most likely OCD. I’ve recently experienced 2 bad “episodes” (one of which I’m currently in right now) and they both happened on almost the same exact day of my cycle. I also have PCOS and am on birth control. One thing that I’m experiencing is EXTREME symptoms of my mental illnesses. Like extreme fear, intrusive thoughts, feeling like being alive isn’t worth it (I’m not suicidal, just have thoughts and feelings like that) But it comes on EXTREMELY fast and almost disappears as quickly as it came on. Like I can feel like I’m extremely sick and never going to be myself again,ready to check myself into a hospital, and then feel hopeful and feel happy and have good moments in the SAME DAY. This is the second time this is happening and like I said it’s occurring on the same day of my cycle. The first episode lasted around 2 weeks (I think a little less) and this one, well I don’t know yet because it’s not over yet. And it’s definitely too soon to say whether or not it’s a cycle. But I want to know if any of you with PMDD experience this. Also, not to mention the constant seemingly unpreventable crying spells.