the illness has seen miss harris lose more than 18 stone -lrb- 252 lbs -rrb- in 20 months , as she regularly vomits up her food and suffers excruciating bowel pain .
at her largest , when she weighed 27st 10 lbs and was a size 32 , she dreamed of pulling off skimpy outfits .
but now , weighing just 8st 9 lbs -lrb- 121 lbs -rrb- and wearing size 6 clothes , she says .