theodosia aresti , 71 , was horrified when sewage erupted from her bath .
the cause was a blocked pipe and her flat became filled with human waste .
sewage from 239 other flats spewed into her apartment .
tide of excrement soaked her carpet and left bedroom smelling ` foul '
was forced to sleep in sewage-filled flat for four days .
workmen eventually fixed the problem and replaced the carpet .
she says the experience left her needing counselling .
theodosia aresti appears on britain 's horror homes , tonight at 8 pm on channel 5 .