Nadine Dorries has failed her first Bushtucker Trial on I'm A Celebrity... Get Me Out Of Here, winning no food for her team.
The controversial MP, who has been suspended by the Tories for joining the show, was voted by the public to endure a "Bug Burial".
She and her fellow contestant, soap star Helen Flanagan, were tasked with lying in underground crates for 10 minutes.
The lids were bolted and bugs including maggots, crickets and cockroaches were poured in.
After 10 minutes, a key would have been dropped in and the first to escape by undoing all three bolts would win dinner for their camp.
Flanagan only lasted a few seconds inside before giving up but Ms Dorries, 55, did stay the course for several minutes.
Maggots were poured into the crate first, followed two minute later by 3,000 cockroaches. As more maggots were dropped in, the MP said: "You're going to bury me if you put any more in."
Some 5,000 crickets were then poured inside, prompting the politician to complain that she was being bitten and she soon asked to be released.
She said: "That was possibly the most horrific thing I've ever done in my life. It stopped for me when something started biting my leg.
"It was biting and hurting and in my mind and imagination it was a rat gnawing into my flesh, but when I came away there were just two bite marks on my skin but in there it was a rat having me for dinner."
Flanagan, best known for playing Rosie Webster in Coronation Street, sobbed after the trial and said: "I'm really struggling. I've even been thinking of going because I just don't know if I can hack it."
She broke down in tears even before reaching camp after having to clamber on a rope bridge high above the jungle canopy.
Ms Dorries, the Conservative member for Mid Bedfordshire, has said she is donating her MP's salary while she is in the jungle to charity.
She caused controversy by agreeing to appear in the show, which will mean being away from her constituency for at least a month.
But she insists her participation will give her a chance to communicate with millions of people who would otherwise not be interested in politics.