Hello,
You may have what is known as sciatica. I would suggest making an appointment with an orthopedic specialist or even a chiropractor for an accurate diagnosis. I suffer from sciatica and when I have flare ups, I have found the modalities used by the "chiro" has provided me with the best relief.
Here is some information related to sciatica. Please let me know of any questions you may think of.
http://www.mayoclinic.com/health/sciatica/DS00516
http://www.spine-health.com/topics/conserv/sciaex/sciaex01.html
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