Has anyone else had a problem with low blood pressure? I've had M...

Has anyone else had a problem with low blood pressure? I've had Mirena for a year now and my blood pressure keeps fluctuating. It goes anywhere from a normal-average BP to the lowest at 76/44. I feel dizzy, fatigued and I can't seem to focus on anything. I'm not sure that it has anything to do with the Mirena, but if it isn't I would like to eliminate it from the possible causes. So far I've had an EKG, chest x-ray, and blood testing and nothing has come up.