The reality star, 23, was taken to hospital last Friday after being struck down with a bug.
She added: "I was worried being ill would affect my votes."
It was the second time Sam had received medical attention since being in the house.
Just days earlier, Channel 5 confirmed that Sam - who was sporting a mark on her left cheek after her face ballooned - received treatment in the Diary Room 'for a medical issue of a personal nature'.
Reports at the time suggested she had suffered an allergic reaction to a mystery substance.
A show insider said: “The poor girl looked like something from a horror movie, like an alien.”
Despite falling ill, Sam has made it through to the 'Celebrity Big Brother' final on 29 January.
She will be up against Dappy, Luisa Zissman, Jim Davidson, Casey Batchelor and Ollie Locke.
Read the full story in this week's OK! Magazine - out now. www.ok.co.uk
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