Mr McDonald said his search for work and the constant rejection were harder to deal with than the tumours.
"It did get pretty demoralising but you can't give up," he said.
His desperation point came when he asked the Herald last month to write about his plight.
He received a number of offers almost instantly including a couple from "some dodgy insurance companies" and within three days he had an interview at Auckland law firm Cone Marshall.
"They could see I was really driven and was going hard out for a job," he said. "I guess they felt a bit sorry for me maybe ... but it was perfect timing, I guess."
Mr McDonald started on December 9 doing what he says is basic bookwork and invoicing.
He says he will still help to do the books at a Tauranga football club after landing voluntary work there last month. "I am definitely not going to walk out on them - that would be pretty rude."
His advice to job seekers and new university graduates is to give themselves the widest exposure possible, even looking at firms overseas if they have to.
"I think a lot of people may have given up and they don't think outside of the box.
"You have to get really desperate and not give up, a lot of people may think, 'Oh, man, I can't do this,' and give up and go and work at Pak'n Save."
Mr McDonald, who was searching for an apartment in central Auckland when the Herald spoke to him, said his job had given him a new lease on life.
"I will probably celebrate with a few beers with my family."
Institute of Chartered Accountants chief operating officer Kirsten Patterson said the accounting job market was flat before Christmas but there was optimism for the new year with corporate accountants in larger teams expecting to increase staff.
She said graduates often focused too much on their academic record and failed to give employers a picture of themselves as an individual.
