Could unexplained pid, liver inflammation, colitis, and severe back and sacral arthritis in a 37 yo obese female be one inflammatory disorder?

STDs. Certain germs that cause pid, notably gonorrhea and chlamydia, can cause inflammation in the liver (fitzhugh-curtis syndrome), proctitis (anorectal inflamation, and septic arthritis. Reiter's disease (another std related to chlamydia, etc) causes a "reactive arthritis" in which it triggers your body to make antibodies against your joints. This combination of symptoms is quite unusual but possible.