First off, I am not suicidal. Been there, this is not it.
But I keep obsessing about suicide. In an odd way it makes me feel better.
Kind of "if I needed to kill myself in this room I would do x and y" in every room. Not that I want to, just that I could.
If I get a bit down (and, again, I've been depressed, this isn't it, just down) I start to think about it more. Just then I caught myself planning out my note, how I would do it, the best way to make sure finding me wasn't too traumatic (I won't go into details on here for obvious reasons - this isn't a suicide tips group!) and so on. I even got as far as thinking "right, I'll do it after this brew..." in the same way I would put off doing the dishes or something.
I even think up reasons I couldn't/shouldn't do it right now - eg the kids are too young, I need to wait till that flower comes out, right down to I'll do it once I've paid the rent or the kids will be homeless.
I'm pretty sure it is reletavilynormal (as in, not everyone does it, but it's not massively worrying) but why? When you think about it (and god knows I think about every single twinge I ever have!) it's a really odd thing to do.