LOS ANGELES - Rocker Bret Michaels is very lucky man.

The Poison frontman who suffered a massive brain hemorrhage last month is walking and talking and expected to make a full recovery, his doctor said Tuesday.

He's even been released from the Barrow Neurological Institute, the Phoenix neurosurgery center that admitted him with "incapacitating" head and neck pain, lethargy, disorientation and slurred speech the morning of April 22.

"I really expect that he will fortunately make a 100% recovery," Dr. Joseph Zabramski, Barrow's chief of cerebrovascular surgery, told reporters. "He's just one of those lucky people, the 20% or so who have a subarachnoid hemorrhage who make a complete recovery and are able to resume all of their normal activities."

The doctor said multiple angiograms failed to turn up evidence of an aneurysm. His medical team still doesn't know what caused Michael's bleeding, he said.

"Patients who don't have anything identified in their angiograms tend to do well," Dr. Zabramski said. "This is one of those rare instances in medicine where we're actually pleased not to be able to find what caused the problem."

He said it will take another seven to 10 days for Michaels' body to dissolve the blood clot around his brain. It's a painful process called chemical meningitis that brings "severe" back pain and spasms, the doctor said.

"Earlier on he was feeling pretty good, and I think he thought he was going to be up and about sooner than he was," the doctor said. "(Then) this chemical meningitis thing takes over and he's really suffering again right now."

Because Michaels is a diabetic, doctors can't treat his new pain with steroids because they could send his glucose out of control.

"Right now he has severe back pain, and when he tries to walk he gets spasms in his backā€¦and the headaches come back again," the doctor said.

Michaels is due for another major evaluation in two weeks, and Zabramski said he made the "Celebrity Apprentice" competitor promise he wouldn't offer any guarantees about his return to the concert circuit or Donald Trump's boardroom.

Zabramski refused to say where Michaels is now -- at a physical therapy center or back home.

ndillon@nydailynews.com