While I disagree in principle to offing oneself, I now have a very different perspective on quality of life issues. Maybe if explicitly discussed in a medical directive so as the fam can hope to understand the wish to avoid pain, quality of life, burden to others, etc. and better cope. Then the bitter pill may be a bit more tolarable to all.
Qualification: Between you, your fam, God, and probably your long term doctor only. No government involvement at any level.