Steve-O is "back in the looney bin," he reveals on his MySpace blog.

Although he has been sober for 115, the Jackass star has returned to "a mental institution" to deal with the effects the numerous drugs he has taken over the years have had on him.

"I’ve now been clean for 115 days, and I’m, again, in a mental institution," he writes. "I did so much cocaine, ketamine, pcp, nitrous oxide, and all sorts of other drugs, that, quite simply, my brain is f***** up."

He continues, "As you can probably tell by the way I’m writing this, my cognitive skills are alright, but, I frequently suffer from horrible mood swings and severe depression."

Hardly any of the medication he’s been prescribed has helped him, the 33-year-old adds, expressing his frustration at the stall in his progress. Because of this, he has chosen to re-enter an undisclosed facility.

"The medication that is prescribed to me doesn’t do the trick every day, let’s just put it that way. I’m back in the looney bin trying to get that s*** right," he says. "The bottom line is that doing drugs f***** my ass up and I’m going to be paying for it for a long time, probably for the rest of my life. Everyone’s going to make their own decisions in life, but nobody needs to make the same mistakes I made."

Steve-O first entered the "looney bin" in March after being placed under a 5150 hold following an alleged suicide attempt.

"After four days in a psychiatric ward…it has dawned on me that a great deal of what I produced, while on narcotics-induced "highs," was a bunch of manic bull**** that made little-to-no sense and, furthermore, was devastating to those who love me the most," he said at the time.

Last month, he pleaded guilty to cocaine possession and was sentenced to a rehab program.

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