amber rachdi , 24 , weighed an unhealthy 46st at her heaviest .
student , from oregon , was confined to her home and was always in pain .
has turned her life around after having bariatric surgery .
ms rachdi has shed an impressive 20st and weighs 26st -lrb- 377 lb -rrb- .
amber rachdi appears on my 600 lb life , thursday at 9 pm on tlc .