I usually just read this board, am more active on the crohn's board than anything around these parts. But I saw your subject line and it hit home.
I've been having suicidal thoughts on and off for a while now. They spontaneously come into my head, and leave pretty fast as well (usually). Anything from waiting for the train and thinking "well I could just step off the platform' as one approaches to thoughts of jumping off a bridge to planning how I can OD on my crohn's meds. I never get to the point of doing anything, but the thoughts are scary. So I wanted to let you know you're not alone there :)
I just started seeing a therapist, have had 2 sessions. My main guise for going is dealing with having crohn's disease, but there are other things I need to get off my chest with her too. The suicidal thoughts only came out in the 2nd, and we reviewed some things like going on meds and how I pull myself out of the depression. I'm not keen on taking meds right now for this, since I'm already on enough crap for the crohn's. I want to try therapy first before going there, so we'll see. Very few people know I have these thoughts in my life, and overall I'm pretty high functioning. I have this weird depression, where I do ok most of the time and then I hit a wall and plunge pretty deep into despair, and that's when the thoughts hit me. I'm not sure how I'm going to get over that, but that's what the therapy is for :)
Anyway, hang in there. I just wanted to add my experiences with this.
"Only the meek get pinched...the bold survive."