I have CRPS, one of the contenders for worst chronic pain you can have. It's a "suicide disease", because if it advances to stage 3/4, there's a suicide rate of about 70%. It sucks a lot. I've had well over 200 spinal procedures over the last 30 years to try to mitigate the pain, with dozens of other surgical procedures in less tricky spots.
I also have Brugada Syndrome, a "drop dead suddenly without warning" disease. When diagnosed, I wanted to take my time before consenting to having an implanted defib. The doctors announced that "Mr Foster, we believe you are not rational at the moment", fortunately I had a friend with me who assured them I was probably the most rational man in Brisbane.
I was threatened with an ITO (Involuntary Treatment Order) if I didn't go ahead with having an internal defibrilator put in me. I went ahead with the procedure.
So I can't even die by refusing treatment, as "sane" people resist dying at all odds. If I don't want invasive, painful procedures that take over a year to recover from, then the courts will claim I'm suicidal and issue an order to the hospitals to proceed with more bloody cutting.
No, sane people say "I've had enough". Fortunately my current GP understands, as he says "Sometimes people feel they've had enough medicine".