The 40 year old appeared on Loose Women to talk about having her excess skin removed after her incredible ;weight loss journey.
But, despite her huge achievement being something to celebrate, the actress couldn't help but break down in tears at the thought of going under general anaesthetic.
Speaking to the Loose Women panel and live audience, Lisa admitted she was 'petrified' about having the surgery.
Trying to hold back tears, she said, 'I'm petrified going under the anaesthetic'. Jane Moore and Anne Diamond tried to comfort the former Emmerdale actress, as she continued, 'It's the ultimate fear that I won't wake up.'
Explaining that the procedure will be completed in different stages, Lisa said, 'It's in two parts with the first part coming up now'.
Pointing at her stomach area, Lisa continued, 'Which is all the excess skin here and all the back fat I have, the inside of my thighs and my lady garden as well.'
'My breasts and arms will be the last.'
As Andrea McLean insisted she would be fine, Lisa thanked the Loose Women audience and viewers for all of their support.
'I just personally want to thank all the Loose Women viewers, and the support I have on social media has been unbelievable and I hope that's going to get me through the next five weeks, which is going to be desperately hard.
'People have judged me and said what they want to say but excuse the pun, I've become thick skinned.'
Lisa has previously opened up about the torment of living with her excess skin after her 10 stone weight loss.
During an appearance on Loose Women in January, Lisa spoke about her upcoming surgery, revealing she'd be having the 'horrendous' loose skin that she's been left with after weight loss removed.
Despite trying to rid herself of the excess skin through diet and exercise, she admitted that surgery was the only option for her.
Lisa explained to the panel: 'I've said before that I've worked with trainers and they've said "There's no training in the world that is going to get rid of this" and I was like no, because I can start feeling - there is muscle under here - and I was working even harder. And it becomes addictive in that sense because you want more and more reaction.'
'But the boobs, the front here - what they call the apron - is now at a point of ridiculousness. So I was nervous, I spoke to friends and family and I was like "no", there is no other alternative.'
The actress and presenter now weighs just under 12 stone. But despite being thrilled with her slimming, she said it's 'awful' looking at the skin that's been left behind.
Lisa, pictured in November 2016, has denied surgery or using supplements during her weight loss journey
'It's awful and it's gone worse and worse. The reflection that I'm seeing now it's just horrendous. Everywhere I go people say "you've done so well" and I find myself going "thank you, thank you" but you've no idea what it's like when I'm in my bedroom with that mirror.'
Lisa added that she's going to have the skin weighed after the surgery to note another stage of her weight loss journey.
Last year, Lisa discussed the motivation behind her surgery plans in an interview with OK! magazine, saying that she finds her thighs 'repugnant'.
'My front and inner thighs are repugnant - they're like a sheared poodle! I can clap without using my hands because my body claps for me during Zumba.'
Lisa couldn't be more pleased with the results of her diet (left: in April 2016, right: in November 2014)
Lisa has strongly denied claims of weight loss surgery, and even underwent a lie detector test during an appearance on Loose Women to prove that she lost the weight naturally.
'I have smaller portions now,' she said. 'I don't believe in fad diets, even though I have tried them before. I have no food after 6.30pm.
'I only eat a carb if I need one and absolutely no bread or booze. I've been going to zumba classes which is fun. I find the gym is boring.'
Lisa, pictured here in November 2012, has lost an amazing ten stone
The soap actress added: 'Doing Strictly [in 2012] kick started my metabolism. I saw a difference dancing seven hours a day and then I just ate soup as I didn't want all that food jiggling around while I danced.
'It's hard for me to see my reflection now. I used to have a shelf from here to here and where's that gone?
'It is insane. I looked so different before. I was happy before but now I am happy and proud.'