The note, posted Sunday morning, alleges "appalling cruelty" on the part of her husband, her children and even her son's girlfriend -- and she says it all started when she had a hysterectomy in August. Sinead claims they've been keeping her babies from her, and she just couldn't take it anymore.
The 48-year-old singer wrote, "I have taken an overdose. There is no other way to get respect. I am not at home. I'm at a hotel, somewhere in Ireland, under another name. I've been howling crying for weeks. And been told by them all to go f*** myself. I'm invisible. I don't matter a shred to anyone."
Sinead has four children, ranging in age from 9 to 28. She's currently married to Barry Herridge -- the therapist she married in Las Vegas after meeting on the Internet.