Sinead O'Connor: I'm Suing My Whole Family ... If I Don't Kill Myself First

Sinead O'Connor's been forced out of her native Ireland by her father, ex-husband and ungrateful son ... if you buy what she's selling in a rambling angry letter about her suicide attempts.

Sinead blames her ex, John Reynolds, and son Jake for forcing her to "run to another continent just to stay alive." As we've reported, she's now living outside Chicago, and disappeared for 24 hours ... leading friends and family to think she was going to kill herself.

She acknowledges having a "suicidal compulsion" and says to the men in her family ... "Every one of you had better pray I die. Because I'm suing the f****** lot of you for what you've done to me if I manage to live through it."

In her Facebook post the singer also rants about abortions, her mother's death, her "psychological destruction" and a mountain of medical bills.

Sinead vows that if God doesn't kill her ... "We are all going to court and we are gonna have this out in full public for once and for all."