music - thats what i love the most in this life, but id say its mood amplifier, so it works both ways.
physical excercises - working out a bit does improve my mood. i also do mixed martial arts which helps me get rid of some negativity and its the most appropriate place to do so.
alcohol - the most effective-short term weapon that makes me forget about things, but i only really utilize it twice a week max., because if i'd do it more often, id stop appreciating it

walk in the park /along the beach - goes well together with music and thus may also work both ways, but i do it almost on daily basis.
coffee! - keeps me awake and active, encourage to do physical activities and thus stops me from thinking how much i hate.. things
driving ruthlessly - also goes well with music cranked right up. i prefer to sing along at the top of my lungs too

movies/books/video games - anything that consumes my attention seems to prevent the nagative train of thought
hookers - i guess they help too, but it raises the question of romantic loneliness, so it may have negative consequences
affirmative conversation with a mirror - the last line of defense, before the storm arrives

Whenever i feel myself sliding down that spiral, i would normally push myself even further down by telling myself "the truth", i would listen to depressing music and would eventually convince myself that this world would be a much better place without me.. I've done it many times before, but i still feel like i have to remind myself about it, lol. maybe i'm enjoying it? who knows, maybe i am a bit of a masochist subconsciously... Lately though, i have been trying to block all negative affirmations and at least attempt to shift my attention somewhere else. It doesn't fix anything and doesn't make me feel better but it surely stops me from feeling worse, which is great! But you gotta take it one step at a time, right?
everyone dies, but not everyone lives...