There is no quick method and I know you're in pain but you should take the time to do your research with the compilation available here:
https://sanctioned-suicide.net/threads/suicide-resource-compilation.3/
Some methods are not available to everyone, some are easier to act on, some are painful, some cost a lot of money. You have to find out what's available for you and what's best for yourself, nobody else can decide for you or if it's your time to go.