I cannot imagine constantly being in pain. Probably because I have always had periods without pain. My worst aches have been of the tooth. Whenever I was in the middle of the annoying prying sting of a toothache I always told myself to really cherish the time when the pain was absent, that I didn't know how good I had it at those times. When I didn't have the toothache I have remembered this but always was unable to be grateful for it. The only way I can feel good about the absence of pain is when the pain disappears immediately, like taking a shot of heroin. But when the heroin goes away the pain gets unimaginably worse. Damn I've got a toothache right now.