Suggestins for puzzling symptoms

Hv and anyone else having an opinion or suggestion: I was speaking with an aquaintance today and found out that her young daughter ( age 29) is having some real problems and doctors cannot find out what it is. Here is what is it NOT: MS, lymes disease, muscles test good. Here are her symptoms: pain ( sometimes severe) from her waist down. It is not localized, and she cannot walk much due to the pain. She needs a wheelchair to be anywhere other than home, and many times must crawl up the stairs pulling herself by her arms. She has had MRI's, CAT scans.... the whole nine yards, but not one doctor has been able to make any type of diagnosis. Anyone have any ideas on what thhis might be and what may be causing it... how to help? Thanks to all who answer!! Tweet