As per the rules I'm not telling you how to kill yourself or encouraging what to do.
But instead I'm gonna tell you my story, take from it what you will.
I've decided I want to go out painlessly but quickly, as a gun isn't a viable option here in the UK. I eventually came across the exit bag method. So I purchased a canister of nitrogen from a welding website, aswell as a regulator and gas mask off Amazon. Its all ready to go though took some diy to get the oxygen mask fitted to the regulator.
Eitherway when it's time in the next few days I'm gonna drive some were secluded, pop the mask over my head with a bag ontop to let the bag fill a bit, then exhale and slip the mask over and bag with it, count to 20 and take some relaxing deep breaths knowing my fear of living is about to be over.
Will likely also leave a note on the window saying nitrogen gas present, call emergency services do not try to assist yourself.