My PMDD is currently highly affecting my ability to study

I am a nursing student in my first year and we have a test coming up in a week. I havent been able to successfully retain info or study well because my pmdd is just making me miserable, unfocused, unmotivated, irritated, and just overall stressed/uncomfortable. This is something that I just wish would happen after the test but unfortunately thats not how things work. Im not sure what to do and honestly I am so afraid to fail this test but am too tired mentally and physically to do anything but lay in bed on my phone, but too anxious to sleep. WHAT do i do??? I feel helpless