The ageing rocker claims to have attended almost three hundred shows last year, often skipping work in the process.
Eventually his last employer tired of his absences and Tullgren was left jobless and reliant on welfare handouts.
But his sessions with the occupational psychologists led to a solution of sorts: Tullgren signed a piece of paper on which his heavy metal lifestyle was classified as a disability, an assessment that entitles him to a wage supplement from the job centre.
"I signed a form saying: 'Roger feels compelled to show his heavy metal style. This puts him in a difficult situation on the labour market. Therefore he needs extra financial help'. So now I can turn up at a job interview dressed in my normal clothes and just hand the interviewers this piece of paper," he said.
The manager at his new workplace allows him to go to concerts as long as he makes up for lost time at a later point. He is also allowed to dress as he likes and listen to heavy metal while washing up.
"But not too loud when there are guests," he said.
The Local spoke to an occupational psychologist in Stockolm, who admitted to being baffled by the decision.
"I think it's extremely strange. Unless there is an underlying diagnosis it is absolutely unbelievable that the job centre would pay pay out.
"If somebody has a gambling addiction, we don't send them down to the racetrack. We try to cure the addiction, not encourage it," he said.
Henrietta Stein, deputy employment director for the Skåne
region, is also puzzled by the move; "an interest in music" is not usually sufficient to qualify for wage benefits.
"Certain cases are confidential but in general there is always a medical reason that is well-documented," she said.
Tullgren currently plays bass and guitar in two rock bands and says that he tends to get a lot of positive reactions for daring to be himself.
"Some might say that I should grow up and learn to listen to other types of music but I can't. Heavy metal is my lifestyle," he said.