"I went to the doctors because I was dizzy and the doctor said, 'You're a bit anxious'," said the Kaiser Chiefs frontman. "Every time I stood up I thought I was going to fall down."
Ricky has revealed he was prescribed medication to combat his nerves on The Voice
In the end though, Ricky, 36, decided not to take the medication. "I was given tablets which I pretended to take – I thought they might do something weird," he admitted.
Ricky credited his fellow coaches, Tom Jones, Kylie Minogue and will.i.am with helping him get through the first live show earlier this month.
"They were constantly there," he said. "When I was flagging emotionally, Kylie would point out the cameras to give me a steer.
"It took every ounce of strength to get on with it, but my fears went as soon as the camera was rolling."
The musician with his finalist Christina Marie
On Saturday, the final of The Voice gets underway, with Ricky's last remaining act Christina Marie going up against Tom's Sally Barker, Team Will's Jermain Jackman and Kylie's Jamie Johnson.
Fans of the show will relieved by the BBC's recent announcement that The Voice UK has been commissioned for another two series.
So far, bosses have not confirmed whether any of the current coaches will be returning.
There have been reports that Kylie will step down after the end of this series to concentrate on her own music career.
She recently told the Mirror that filming a fourth series of the talent show would clash with her upcoming Kiss Me Once tour.
It is not yet know which judges will return for the fourth series of the show
"I'm touring this year and the timings wouldn't work," the 45-year-old said. "I have loved it, although there have been parts which have been really difficult, to taxing and emotional."
Ricky has already admitted that the chance to work with Kylie was one of the main reasons he signed up to the show, and has said he can't imagine doing it without her.
He isn't the only member of the panel hoping she will change her mind. Sir Tom has said he thinks the BBC "should do whatever they can to keep Kylie".
"It works how it is right now," he said. "With the four of us, I think it's a good combination. It's working now, so why spoil it? Why change it?"
Kylie and Ricky joined the panel this series alongside returning stars Tom and Will. This season, which ends this week, has been a ratings hit with 9.41 million viewers at its peak.