My wife is 27 years old she have regular periods every month. But when she get periods on first day she experiences full stomach pain and she vomits for 3 to 4 times . After vomiting she will get a bit relief from pain. This is happening to her for almost every period cycle since her 13 years age. What could be the reason for her pain. How to get rid of this pain. She rolls on the floor due to unbearable pain which she get. We don't have children yet. Please let me know if there is any treatment for this and cause for this. Does this pain creates any problem in conceive?