What Does Pain In The Lower Abdomen On The Right Side Indicate?

i have lower right abdominal pain (above my rt pelvic bone slightly lower than my bellybutton, but more right) that has been progressing for at least a year. So far I have had the following things done or seen the following clinic/doctors: 3) CAT scans (abdomen - 2with contrast), MRI, 2) XRAYS (spine), 2) Sonograms, Mesenteric Vascular Duplex study, a round of strong anti-biotics, complete Hysterectomy, colonoscopy, upper GI. I ve seen a OBGYN, UROLOGIST, MUSCULAR SKELATAL DOCTOR, GENERAL SERGEON, PHYSICAL THERAPIST (INTERNAL PELVIC FLOOR EXAM), DIGESTIVE HEALTH CLINIC and, lastly, an Orthopedic Neurologist. The pain started a year ago - light pain after a long day, progressing to pain all day escalating quickly when I walk. I have to sit down and rest to bring it down to tolerable level but it is getting to where I hurt all of the time. I do not take pain meds yet. I have no Gall Bladder (since 2003), have irritable bowel syndrome, hypothyroidism but otherwise healthy.