Tips for managing period anxiety spikes

Hey everyone! Hope the new year is going well for everyone so far. I'm seeking some advice for managing anxiety spikes related to a menstrual cycle. I completed NOCD therapy a bit ago (whoop-whoop!) and feel like I'm fairly successful managing my OCD most of the time. But I've noticed a very distressing pattern lately. About a week before my period starts, my OCD becomes very hard to manage. I get terrified, frozen to do anything, and get triggered super easily by things I can normally brush off. This lasts until a couple days after my period starts, which is normally when the anxiety wave "breaks" and I feel back to my "normal self". In total, I can spend 10-12 days in this awful anxiety funk, which has been hard because I feel like I've made so much overall progress in my recovery. I really try to prepare for this each month and be extra strong, but I feel like I have to break down into tears at some time and can't get through my cycle without at least one big breakdown. I also feel extra isolated during this time, as my bf (who's been super supportive of my OCD experience and am truly grateful for him) does not have the most sympathy when it comes to my period. I don't think he understands how much this affects me. I would love any tips/strategies for how people manage this time, so it's not as disruptive. I know it won't be perfect, but I think I could be doing more to manage this time better. Thanks! :)