What helps me is, to decide tomorrow. Suicide is a big decision so I tell myself I need to sleep on it and decide tomorrow. The decision to think about it later usually stops me from ruminating on it in the now and helps me focus on something else..usually a book. Then I tell myself tomorrow for as many tomorrow's as I have to...if I can't do that I take it one hour at a time, if it gets worse than that I talk to a professional and let them help me decide if I'm safe.