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Consider this: what guarantee do you have that it does get better after death?

Correct me if I’m wrong, but you don’t want to die per se, you just want for the pain to go away. But we know nothing about what happens after death. It’s a risky move.

Lots of other great advice in here, but this thought hopefully makes you reconsider doing something irreversible that may actually turn out not to help you at all.