Prolactin levels are high. This pain?

A cousin of mine is studying and has finished her degree. From the past 6-8 months she's having periods problem and it's extremely painful for her during the periods time and it gets postponed to around 45-55 days for her to have her periods. She suffers from severe back n stomach pain throughout the 5 days n sometimes even more than that. We went to a gynaecologist and she got some blood tests done and the prolactin level is severely high where the normal range is till 18 where as hers show as 49(as stated in the report) we later went to another doctor and she got another prolactin test again and it still showed it to be high. She suffers from headache and she feels tired very soon. The doctors we met are really not giving us a clear picture.. We got a ultrasound scan n there is no problem in it.. Now the doctor says we need to get an MRI done. Why is it required? Is it somethings serious? Do we have to consult another doctor? What is the way out for her to suffer from this pain?