hi,
the spine is a connected column therefore any misalignment can influence different areas of the body.
TCM (traditional chinese medicine) knows that there are connections through meridians and functional circuits and that is why a problem in the lower part of your spine can very well contribute to a migraine.
beside that a lack of water and nutrients may further be a contributing cause.
you may try first the recommended exercises for self help and realignment of the spine in http://www.dorn-method.com and give me some feedback then which you are free to share with others here on curezone.
of course you may email me anytime for further advice (free)
blessings
Thomas Zudrell, DMS