That's not one of my worries when it comes to suicide, though I've found that to be the most common worry around here. In my case, I am worried I won't ever get the courage to do it in the first place, because I know for a fact I'll succeed. It won't be a last moment decision or an impulsive one, it's something that has been building up for most of my life. I have the knowledge and means I need to succeed. Of course, being left a vegetable would be my worst fear - But the chances I will live a long life of pain because I'm too afraid I'll fail sounds way worse to me.