Two to three days before due on and the first two to three days of period are worst MG wise , weakness and fatigue is much worse , pyridostigmine requirements much higher. Then everything settles for about 15 days slowly worsening in a predictable fashion towards the beginning of my period again. I found when I had progesterone implant, I was much worse.
Nothing really helps other than more medication during that period and general advice for any mg symptom and general advice for anyone who has a period. Nothing special sadly. I try to take it easy, warm baths/showers if I know I can just collapse in bed afterwards, some comfort food and things that I enjoy symptom dependent. Heat packs for period pain. Painkillers where able. Try not to take too much on, exercise where tolerable/manageable and errm..... Chocolate : )