When I have suicidal ideation, I tell my T exactly what I am thinking - the exact specific details. It's like having a release valve. If I don't do that, it builds up in me to the point where I can't function. Talking about it releases that tension. Depending on the level of accompanying depression, that helps a lot.
Silly as it sounds (hoping I didn't just call someone silly cuz I didn't read the other answers!) talking walks outside really helps lift my mood. Can be in the city, in the country, anywhere. Just getting some air and moving seems to motivate me to do something when I get back home, like laundry. So, then I've taken a walk AND accomplished something! Wow. I'm on a roll. Maybe I'll even aswer the phone when it rings! Say it ain't so!
Take care. Emmy