What Causes Left Sided Pelvic Pain And Breast Tenderness?

Hi, I m 22 years old. I got my first period when I was around 12-13 yo and have been irregular ever since. I went to the GYN for the first time at 18 yo and was prescribed birth controll pills. I took them for about 6 months and then stopped. Period remained regular for next 6 months then became irregular again. Visited the GYN again, had an ultrasound (everything fine) at 19 and was prescribed birth controll pills yet again for a year which then was prolonged for 2 years. Stopped taking them on January 2015 and on May 2015 had blood tests which showed very high prolactin levels (200). Went on cabergoline for 2 months. Up to today, I have had an average of 34 day cycle since September 2015 (shortest cycle: 26 days, longer:50) I occasionally (6 mo apart) get sharp left ovary pain or sometimes (less common) a general excrutiating pelvic pain that lasts for a few minutes that is generally followed with breast tenderness the next few days (started getting them 4 years ago, sometimes 3,6 mo or a year apart). These pains are usually on my ovulation period according to my period tracking calendar. I am worried that it might me something serious. Last ultrasound (may 2015) showed nothing abnormal.