Guns
If I had a 100% reliable way to end the pain right at this moment I would use it. No messy and unpredectable wrist-slashing, drug-taking, or gas-ingesting that might just worsen the problem.
I know for (almost) certain that I will feel better eventually. I don't know for certain that I would be happy to wait, if I had the Hemmingway Solution available to me.
For this reason alone, I feel confident in saying that if you share a house with anybody, and you choose to keep a gun in that house, you are an unforgivable dick of the highest order. In fact, come to think of it, I don't feel quite so bad about myself now, compared to you utter shits who store human-killing machinery in close proximity to your (presumed) loved ones for no other reason than to buttress your sagging sense of manliness.