Thanks for the query.
Some amount of abdominal cramping is common during ovulatory period.
But as you are having severe cramping, better to consult gynecologist once and get examined.
You may need one ultrasound
to find out the actual cause for your problem and to note the present size of the fibroid
Meanwhile you an take some antispasmodic drugs to get relief from pain.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429