The former San Francisco fire commissioner who survived a brutal crowbar attack said his home city “is burning” after the district attorney dropped charges against his assailant.

Don Carmignani, 52, was assaulted by a transient outside his parents’ Marina District home three weeks ago in a caught-on-camera attack.

Speaking to CBS from his own home next door to where the assault took place Tuesday, the fire veteran described the extensive injuries – and lamented how he is left grappling with agonizing pain.

The San Francisco native wore a hat to cover the scarring and bandages on the top of his head. He was visibly upset as he discussed how a plastic surgeon spent “hours” and required “five layers of stitches” to sew his jaw back together with a metal plate.

“My mouth feels like it’s been ground up by a meat slicer,” he said haltingly. 

“I’m happy if I get two hours of sleep a night,” Carmignani said as he gestured to show how his attacker smashed his jaw and skull and tore a wound into his arm as he tried to defend himself.

“The bone pain is so awful. Even with [oxycontin], it doesn’t mask it enough.”

Carmignani was dealt an added blow Tuesday when city prosecutors dropped the charges against his alleged assailant, Garrett Doty, on grounds he acted in self-defense after Carmignani deployed pepper spray at him.

Carmignani claims he is also struggling with short-term memory loss in the wake of the beating. 

“You don’t know whether you’re coming or going,” he lamented.

“My city is in chaos,” Carmignani sighed, describing how his ancestors arrived in San Francisco in 1902.

“[The government] is driving out all the locals and all the people that pay taxes.”

Carmignani went on to say he believes the police and prosecutors’ “hands are tied,” and that “politicians must be held responsible” for perceived public safety failures.

Citing a lifetime of experience with police and firefighters, he alleged “the city doesn’t do nothing unless someone tells them.”

“Something needs to change,” he insisted, adding: “The city is burning.”

Carmignani told the outlet his attorneys warned him he could be charged over the pepper spray, which he claims he deployed after his mother repeatedly complained about Doty and two other transients blocking her driveway while smoking crack cocaine.

He said he recognized two of the individuals, including one male who he said were responsible for “fighting [and] break-ins” in the area “month after month.”

Carmignani claims his aiging parents would not leave their house because of the trio and multiple calls to law enforcement went unanswered.

“I went out there to try to get them to move on,” he explained.

“I didn’t go out there to fight anyone. I’m trying to get them down the road, go to the park. It’s three-on-one. I know odds. I’m 52 years old. I have two hip replacements. I’m an old guy, I could have been a dead guy.”

Carmignani shook slightly as he recalled Doty whacking him repeatedly while screaming “‘Die, motherf–r, die.’” Bystander footage of the incident shows Carmignani crumpled and wiping blood from his eyes as he struggled to escape the man’s wrath.

“I couldn’t see nothing,” he said of the terrifying ordeal.

“I thought I was gonna die at that point.”

The attack on Carmignani notably took place just one day after Cash App founder Bob Lee was stabbed to death on the streets of the same city.

Lee, 43, collapsed in the early hours of April 4 after bystanders ignored his anguished pleas for help after being stabbed three times. Although it was at first said he had been targeted in a random attack, it later emerged he had an altercation with an acquaintance who was known to him.

His accused killer, IT consultant Nima Momeni, appeared in court briefly yesterday. His attorney confirmed that he intends to plead not guilty.