"I honestly recoil. It's scary to look at that. I was a sick guy," Perry said of that time.
The "Go On" star said that he tried to hide his problems with drugs and depression from his "Friends" co-stars.
"I think I was pretty good at hiding it but, you know, eventually people were aware," he said.
Now sober, Perry works to help others overcome their addiction. He recently received an award from the Obama administration's Office of National Drug Control Policy for his work with recovering addicts.
Perry described the experience as "a very surreal thing."
"We're award-winning alcoholics," he said.