Cindy,
sounds like you need some PT. I'm not one but I have continued many of the exercises I learned from PT and my foam roller and exercise ball are priceless to me. There are definitly things you can do. the sciatic and other nerves from the lumbar region are most likely tightening all your muscles and joints. You probably need PT exercises and specific trigger point release and deep tissue massage. that is what helps me get by.
The nerves from lumbar really affect muscle groups all over. here are a few pages I looked at to understand things. I also got myself an atlas of human anatomy to picture things better.
http://www.med.mun.ca/anatomyts/nerve/nerve.htm
http://www.med.mun.ca/anatomyts/nerve/lumbnerv.htm
http://www.med.mun.ca/anatomyts/nerve/femnerv.htm
I also found at a med sch book store a cd the shows the innervation of muscles and how they move. It was called The Body in Motion. It's not necessary to have but I wanted more info to better understand how everything worked tog. For more info you can go to:
http://www.primalpictures.com/Shop/S...x?ProductID=40