In " Pain Free in 6 Weeks..." by Sherry Rogers MD. She says it is worth it to try avoiding all nightshades for 3-4 months and see if your pain lessens or goes away entirely. She says it was Dr. Norm Childers that did the research on nightshades. Both Sherry Rogers and Norm Childers swear that a diet without nightshades can rid you of pain you've suffered for years. I think it's worth a try!

http://www.noarthritis.com/nightshades.htm