Supply tanked

Please help me. My baby is 4 months. BF was going fine until last week when all at once, I went back to work, started grad school, my mom had a heart attack and my stepmom died. I dont fill up anymore. At work I pump 4 oz total every 3 hours and now as the day goes on it can be as low as 2 oz. TOTAL. Oh and my period returned. Im taking calcium magnesium for the 2 weeks but see no difference. I have been taking legendary milk and milky mama supplements this whole time. I dont know what else to try. I dont want my daughter to starve. She will not stay at thr breast and keep sucking when nothing is coming out.