*Taking a page from Floyd Mayweather Jr., Dr. Conrad Murray is begging a judge to release him from L.A. County Jail because it’s taking an extreme physical toll on his body, adding if he doesn’t get help soon, he believes he’ll die behind bars.

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Unlike Mayweather, Murray is not asking for house arrest. Instead, he wasn’t to be transferred to prison, where he believes he’ll get better care.

Murray’s lawyer tells TMZ, he wants to serve out his time in prison because he’s being mistreated in L.A. County jail — getting fresh air once a month, and fresh underwear only once a week.

TMZ reports:

As a result of the alleged deprivation, we’re told Murray’s health is failing — his hair, nails, and skin are gnarly  … and he’s been suffering from a constant headache over the last few weeks.

Murray says he’s never gotten headaches in the past — and is worried it might be a brain tumor.

We’re told Murray asked to see a doctor, but got shuffled around and has received no medical attention.

Murray told his attorney, Valerie Wass, “I may not make it out of here alive. This is a very dangerous place. I’m in here dying. The system is intent on killing me.”

A rep for the L.A. County Sheriff’s Department tells us, the department doesn’t comment on pending cases.