Carter (31), who first shot to fame with his Wagon Wheel smash hit song, eventually found a lifeline for his anxiety and depression while listening to Bressie discussing mental health issues with Imelda May on his podcast, Where Is My Mind.
"You don't realise how much you miss something until it's taken away," Nathan tells the
"I had often said that I'd love to take three months off, or six months off, but I'll never be saying that again."
The lack of work and uncertainty about the future eventually took its toll on his mental health.
"I was listening to Niall Breslin's podcast and Imelda May was on it, and there were different therapists talking about the issues.
"It sounded so normal, the way they talked about it. So I thought, 'what have I got to lose by trying this?' I contacted Bressie and he gave me the number of the girl that he works with, who is a really qualified therapist in lots of different therapies.
"It was a great help. They don't solve everything, obviously, but it's just a matter of being able to talk, because sometimes you don't want to talk to your family or your closest friends about any of that stuff… you don't want to burden them.
"I would definitely still urge anybody that's feeling down or feeling not in the right place to go and chat to someone.
"I found the lady I went to said hardly anything, and I just literally sat chatting for an hour. You don't realise how much you have to get off your chest and that you need to talk to someone.
"It's having someone to sit there and listen to your problems. It's not about them, it's about you.
"That was a big thing, for me to go to a therapist and to tell people that as well because I have been open about it.
"If me speaking out can help anyone else, then that's great. There was a lot of stigma attached to the idea of going to speak to a therapist, particularly for a man because I think we just like to bottle everything up.
"Not that we're all the same, but men in general are not very good at expressing their feelings."
Did he feel the benefits of it? "I did, I could see the bits where I was going wrong and what I should deal with," Nathan says.
"Stress is the thing, and I could see where the stress is coming from. I couldn't pinpoint it before. I didn't know why I was feeling a bit sh*t some days.
"It was the whole thing of not being able to play music.
"Music is a therapy at the end of the day. When that was taken away from me and I couldn't do it, it had a huge impact on me.
"Then the minute we started gigging again my whole ethos just changed, and I was feeling great again. It's crazy.
"I watched I'm A Celebrity and the footballer David Ginola was saying how a lot of footballers deal badly with it after they finish playing in their mid-30s.
"They go from a massive high to stopping overnight when they retire, and that's the way it was for musicians in the lockdowns.
"You miss the buzz you get from seeing people enjoying what you do, whether it's playing in a pub with 50 people dancing and enjoying themselves, or playing in an arena, it doesn't matter, it's the same thing.
"So it's been a tough couple of years for musicians, and everybody else out there, to be honest."
Nathan tells how many musicians and technical crew have either left the business or now need to double job in order to make a living as a result of the devastation of the live entertainment business.
"I was so lucky that out of all of my crew I only lost one guy, but most of them are still double jobbing to make ends meet and it's the same across the industry, which is very sad," he reveals.
"These are seriously talented people who have gone to college and studied for years to do what they're really good at doing, and now they can't actually do that as their profession full-time any more.
"My new year's wish is that that won't be the case and professional people within our industry can go and do what they do best, and do what they have worked so hard at all their lives to create their own careers."