Mine hasn't been constant, but the feelings have come and gone for the past 20ish years? Mostly, I "simply" experience depression and these agitated thoughts like, "fuck, I hate my life."
But every now and then, the actual suicidal thoughts come in full force, and those have been the times I've carried through with an attempt. Except for the most recent time. I never got a chance to put my plans into action, which I've spoken about repeatedly on here, so I'm not going to type it all out again.