You need to seek out a Lyme Literate MD and rule out Lyme Disease.  Lyme is the great imitator, and can cause a myriad of symptoms.  I was originally diagnosed with RA in 2006, then MS this past January.  I finally got a correct diagnosis of Lyme Disease in June after taking a Western Blot test through Igenex Lab.  The spirochete that causes Lyme, can also cause lesions on the brain (which I have).   It is important to seek a Lyme Literate MD, as most practitioners are either unfamiliar with treatment protocols, or they will follow the IDSA's ridiculous recommendations, and the infection will continue to cause issues.