I cannot stand my fiancé during my luteal phase

On top of feeling like a complete loon once a month, I also get into this horrible cycle of not wanting to be around my fiancé. I try so hard to stay mindful of my pmdd, but it’s as if it’s impossible to remind myself that this is just something that happens every month. I’m lucky if I don’t completely crash out and spiral a week before my period. It’s like I want to quit/abandon everything… run away and live in solitude. I don’t know what it is but I want it to stop, it’s literal torture.