Dealing with Mood Swings: Seeking Advice

I have recently noticed a pattern of my behaviour and now realise it has been going on for years (like since I was 8). it's big mood swings over time, a few months each. like I have my more depressiony time where I don't want to do anything or get out of bed for ages and sleep a huge amount. I have a time where I'm actually doing okay, I think all the rest from that helps my brain. and then I go up and get really high energy and irritable and angry and paranoid and dissociate and lose a lot of my self preservation skills. like I don't eat much or sleep much and do dangerous things (especially sexual stuff like prostitution) and I get a lot more intrusive thoughts and very violent. I mentioned it to my psychiatrist and she kinda brushed it off but it worries me. I can feel I'm getting to that again and I don't want to it really sucks and I get suicidal during it. im pretty sure it's from the cptsd. I guess I'm just wondering if any of y'all go through this, if you know what it is and if you know anything I can do to lessen it