Round four: Sinead O'Connor begs Miley for an apology

It's the feud that can't stop and won't stop.

Sinead O'Connor has now penned a fourth open letter to Miley Cyrus, demanding an apology from the provocative pop star.

Starting "Dear Miley," the rambling 1,800-word letter from the 46-year-old Irish singer, posted to her Facebook and website, tackles the stigma of mental health, suicide and how her correspondence with Miley affected her reputation:

On Miley calling Sinead "crazy" on the Today show:

"I would very much like you please to apologise to myself and Amanda Bynes for having perpetuated abuse of both of us on the grounds that Amanda has had 'mental health issues' and that I experienced suicidal compulsion and was open about seeking help in order to save my life."

She also asks for an apology to "all sufferers of mental health difficulties and all those who have had experience of suicidal feelings or who had been affected by suicide."

On her 2-year-old tweets:

"Also I would appreciate you stating publicly that the tweets of mine you posted (wherein I sought a psychiatrist from outside Ireland so as to save my life) were in fact two years old and do not reflect my current medical condition. This is because it is extremely hard to get employment when people think one is in mid-breakdown."

On the backlash she's received from writing the open letters:

"No person, myself included, should wake to the types of e mails and communications I have had for the last few days urging that I should kill myself, nor to the type of 'net abuse' I have had to endure as a result of what you did."

Her take on the "feud":

"I have no interest in the 'feud' which media want. There is no 'feud' as far as I am concerned. What there is however.. Is a lot of very serious harm caused to myself and my children and probably to Amanda, and DEFINATELY to silent sufferers of your own age who may look up to you."

For more on the Miley-Sinead saga, check out the first, second and third open letter.