You're absolutely right, you know, one of Abraham Lincoln's famous quotes says "Don't get angry, get revenge" and this is my life code. I sum up everything people do to me, I try to add to my mind as many plots as I can think of to have a decent vengeance, but most of the times I end up having mercy for them unfortunately, they didn't deserve it and I regret it often. That ended last year though, and I've been much more firm about this, I always take revenge on someone who's disturbed on purpose either me or someone I care for, that's the only language bad people understand (≧∀≦) .
About the second one, it's kind of yes&no... In fact having a healthy life does in fact help you live more comfortably and with less stress, less problems to care about ●﹏● but it does have its limits like everything in this world. You won't become immortal, and dying young is rare but it does happen because certain illnesses are very dangerous and often lead to death no matter how strong your immunitary system is ╥﹏╥ . But please do care about health, as it is literally what allows you to be yourself and show your ideas to the world.
Sayonara! (^∀^)ゞ