Civil servant Will Stoodley was beaten unconscious by gang during an unprovoked New Year's Day attack at Harrow Bus Station.
Mr Stoodley blacked out during the assault and was found lying in the middle of the road by an ambulance crew. He woke three hours later in a hospital bed to be told he may have a fractured his skull.
The 44-year-old is still off work from his Land Registry job in Harrow and is appealing for witnesses to the attack to contact police.
He said: "I was on my way home from a New Year's Eve party and was waiting for a bus home between 2am and 3am on New Year's Day.
"There was a gang of half a dozen black youths, Two of them initiated a conversation to accuse me of following one of their girlfriends from Harrow-on-the-Hill station to the bus stop.
"I said: 'I'm just waiting for my bus.' A punch came out of nowhere. It knocked my glasses off and I bent down to pick them up, and that's the last thing I remember.
"Apparently, I was found unconscious on my back in College Road, and I came round in Northwick Park Hospital.
"My face was swollen, I had two black eyes and possibly a fractured skull. I was beaten very badly."
A doctor suggested Mr Stoodley had been smashed on the head with a blunt instrument and a nurse has ordered he undergo more precautionary head scans.
He believes there were quite a few other passengers milling around the bus station in the early hours of January 1 and is urging them to come foward.
By coincidence, Mr Stoodley was a victim of another unprovoked attack on a Christmas Eve more than a decade ago at the bus station.
A Harrow Police spokeswoman said: "At 2.46am on Thursday January 1, London Ambulance Service was called to reports of a male who had fallen over at Harrow Bus Station. The male had head injuries and was taken to Northwick Park Hospital.
"The following day police received and allegation of an assault commited against a male in his 40s. Officers have spoken to the man and are currently investigating. There have been no arrests."