Welcome to Healthcare Magic
The pain is due to the shedding out of the thick endometrium and contraction of uterus
. You need to drink plenty of fluids. Better to take rest. You can take pain killer with muscle relaxant
like Diclomine drug or Buscopan
drug for best relief under medical supervision for 2-3 days after a meal. It will disappear soon when period is going to stop. If the pain does not subside you need to go to the Hospital.