Try reading up on ankylosing spondylitis - also an autoimmune disorder - affects the lower spine. See if it sounds like what you're experiencing. Or perhaps someone here has this type of arthritis and can answer your questions.
Hey Sherry.. Welcome to the Arthritis side of the house.. Like Mary said, try checking out this website it is the Spondylitis Association of America website.. pretty good site with lots of info.. here's a little bit from them..
An Overview of SpondylitisSpondylitis (pronounced spon-d-lie-tiss) is the name given to a group of chronic or long lasting diseases also called Spondyloarthritis (spon-dyl-oh-arthritis) or Spondyloarthropathy (spon-d-low-are-throp-ah-thee). These diseases are forms of inflammatory arthritis that primarily affect the spine, although other joints and organs can become involved. Spondylitis, unlike many other rheumatic (arthritic) conditions, affects young adults and commonly begins before the age of 35. Prominent researchers have stated that AS affects at least 1 in every 200 adults (approximately 0.5%) making it as common as rheumatoid arthritis.