The 52-year-old truck driver from Wagga has spent the past five weeks undergoing radiotherapy and chemotherapy after doctors unexpectedly found an aggressive tumour on his brain.

"After one of my first radiotherapy visits, the nurse gave me some information about [COVID-19] and said that if I catch it, it would be detrimental to me, my family and everyone in the cancer clinic," Mr Harmer said.

"That made it essential that I not go out at all.

"It's scary to think that the virus is spreading through the whole world, there's so much tragedy around because of it."

At the moment, Mr Harmer is attending radiotherapy sessions five days a week and completing a course of ingested chemotherapy every day at home.

"I'm very lucky that I only have to take the chemo tablets an hour before I eat every day," he said.

"I've had a few side effects. Hair loss and tiredness, but that's expected. I'm trying to remain upbeat."

Despite his predicament, Mr Harmer is content to stay positive, and instead of dwelling on his own struggle, is thinking greatly of his fellow truckies at his former workplace at Burkinshaw's Transport.

"I feel for them, they're working harder than ever and I wish I could be there to help," he said.

"I was hoping to stay at work, just to volunteer and help out, but I've had to stop that."

At the beginning of his treatment weeks ago, Mr Harmer did have the chance to get down to the Wagga-base transport offices to help with the washing of the vehicle fleet.

But amid the growing concerns for COVID-19, he has had to abandon the notion.

Following his diagnosis in January, the company began a crowdfunder to help the Harmer family pay for treatment.

Its goal of $10,000 was eclipsed by the eventual total over just over $52,000.

"I still can't believe it got to anything like that, I'm just so grateful to everyone for their support," Mr Harmer said.

At the very least though, Mr Harmer's days of isolation has afforded him an avenue to build awareness for another cause that sits close to his heart.

"I'm doing something called the 365 days of Phelan lucky for my children Emily and Tom who have Phelan McDermid syndrome," he said.

Every day, Mr Harmer photographs himself wearing a 'Phelan Lucky' t-shirt, and provides an online blog of his day-to-day activities.

He hopes to provide a moment's inspiration for his online followers while highlighting the little-known chromosomal condition to those who might otherwise be unaware of it.

"I've never been able to do much to raise awareness for it when I was a truck driver, I didn't have the time," he said.

"Now I have the time to raise awareness and it's therapeutic for me. It keeps me occupied and my brain ticking over."

Aside from his new-found online presence, Mr Harmer is also using his isolation to connect with friends and family from the Wagga Baptist Church.

"I didn't have a lot of time to do things, now I've been able to join a Bible study, though I have to join in by Facetime," he said.

Above all else, Mr Harmer is committed to keeping his outlook bright and using his isolation to achieve much.

"No matter what challenges we face, there's always a reason to smile," he said.

"Things are different with an uncertain future, for me as well, but you have to make the most of every day.

"I was given a poor diagnosis, but I'll be here as long as I can be, and I'll be positive about it."