Rest and rest. When you’re finding it tough to do a lot of things with intense lower back pain from your period, get a couple of days yourself. Relaxing with a great book, some gentle yoga, or just a warm bath might support improve the endorphins that naturally fight pain. https://www.theorthopaedicandpainpractice.com/find-relief-from-lower-back-pain-with-orthopaedic-and-medical-care/