When I fight elites, they drop health globes after you damage them for a while. I just use spirit walk and go in and get em and get back out if I really need to heal.
When I face reflect damage, I let my pets pound on them and use ghost bomb once in a while to drain their HP. If I am below half HP, I just let my pets do most of the work and spam zombie bears whenever I get spirit walk up.
Life orbs are all you need