shrinking at 29 years old

[susanlee]

im a 29 year old woman.ive lost 3 1half to 4 inches in hight in about a 10 month period.ive been 5ft6 112 pounds since im 17 yrs old.well the weght give or take over the yrs.ive just sunk below my older sisters hight who s 5ft4.ive been to doctors had tests run and i have no osteo no bone loss.and im in no pain thank goodness.but they cant pinpoint why im shrinking.ive olso lost 18 pounds during this.ive been to an ortho an endocronology clinic.and nothing.im getting a clean bill of health.os ther another way to go about this???or another type of doctor i can see????im in no pain but the stress is killing me and im very frightened.thank you susan