By Laura Armstrong Hannah Spearritt says she felt so ill while training for Dancing On Ice that she feared she might have to pull out of the show. The former S Club 7 star, who has suffered from an auto-immune condition since 2013, missed at least two sessions a week after a tooth infection triggered a severe relapse. And she felt so nauseous during some rehearsals, she ended up sobbing. Hannah, 42, signed up for the ITV show after pulling out of an S Club 7 reunion following the death of her ex-boyfriend Paul Cattermole in April. But after battling through the trauma, she is back to her best …