The 'So Macho' singer was eliminated from the jungle last Friday and admitted that the show was tougher than she expected.
Sinitta told Lorraine on ITV1: "It's just much worse than you expect, as in you really are 'outside' - they don't take you back to the hotel afterwards.
"When they say, 'When you're not filming, you're in the Versace hotel', they mean once you're out of the show - not at the end of the day."
Of fellow contestant Fatima Whitbread getting a cockroach stuck up her nose, she added: "I literally would have had a heart attack. And that was my biggest thing – that's why I didn't want to do the bed bug thing with them crawling out or being trapped in a box with them.
"I definitely wouldn't have gone into the goldfish bowl where they fill it up with things... poor Fatima, apparently it took 20 minutes to get that thing out."
Regarding her experience on the show, Sinnita said: "I'm so glad I did it because now, having been overwhelmed with things, if I see like one bug or one spider, I'm not terrified of the bug or spider anymore.
"Because it's such an extreme thing to do that one seems like nothing to me now, whereas I used to literally run screaming from one spider or one bug, so it has helped."
> 8.3m watch Sinitta leave I'm a Celebrity