TD - Stop that talk right now!!
The mushroom season in the UK is good for killing one's self quickly. Go down to the woods in Autumn and look for mushrooms with red on them, dots etc. The more exotic looking the better. Then eat a few and have a good glug of vodka to dull the pain... off you go, dead very quickly!
If you want a really terrible death you can get a pestal and mortar, grind up some glass and then add the ground glass to a glass of beer/coke. A good measure will shred your internal organs to pieces over a few days, resulting in an agonising death!
Funnily enough Paracetamol is very lethal to the body in large doses too. (Hence why they only sell them in packs of 16) If you down around 30 or more it will do major damage to the liver and kill you.
I could go on....
But it's a cheats way out..don't be a quitter, face life and deal with it, take it on and win!!