It's the week that Charlie Sheen came unhinged. Since production on his uber-popular sitcom 'Two and a Half Men' was derailed over fallout from his latest bender, the star has been on a frenzied media blitz -- apparently to promote the drug he says he's on, "Charlie Sheen."

The feverish interviews have teetered between neurotic and delusional. His self-described "grandiose" behavior has led some to speculate that the 45-year-old actor may have bipolar disorder.

"He looks bipolar -- he's in a particularly manic phase," celebrity psychology expert Stuart Fischoff tells PopEater. "His reality testing has been severely impaired, marked by delusions of grandeur. His head now is as large as the moon."