Omg that sucks doesn't it? I hate that. I hate to cry and then on top of that to cry for no reason? Ugh, I get it. I have done neither of those things, but my reasons include my kids (children whose parent's commit suicide have a 50% greater chance of doing it themselves), not wanting anyone to find that, and my method that works best (as those two don't always) is when I feel suicidal I will pick a date in the future, typically about three months away and say I will do it that day. It seems to kick my brain off the obsession like in some weird way it's satisfied you know? And then I make a point to commit to doing things for others around that time, or I consider holidays or whatever.
Typically when that date rolls around I 've forgotten OR I have some commitment and GOD FORBID I disappoint anyone so then I can't do it. I've never actually had the perfect storm where none of that matters and I'm still in that cycle of wanting to. I also have a contractual annual agreement with someone I trust my life with and I must call them before I hurt myself. You will note that they do not nor do I agree to NOT do it, I just have to physically speak with them on phone. All of these things help, they may not be the ultimate healthy choice, but they work for me, I hope you might try them and I 'll consider journaling as well.