What could be causing my continued joint (multiple joints) plus fatigue?

I'm a 32 year old female, good physical shape (15 lbs above goal weight). Around 1 year ago I started having sporadic joint pain in multiple sites. Sometimes the pain is bilateral, sometimes it is in only one side. The pain ranges from my fingers and hands, shoulders, hips, knees, feet and toes. I've been tested (multiple times) for gout, lupus, rheumatoid arthritis and various other connective tissue diseases- all of which were either negative or inconclusive. I have confirmed high levels of inflamation via a sed rate test (which is consistently above 30) and a CRP that stays around 2.0. Some days I will feel almost perfect and other days I can't even leave the bed. What can this be? What do I need to do to help my rheumatoligist find an answer to help me lead the active life that I desire to lead?