For many fights in ICC the Glyph of Divine Protection is your newest and bestest friend. Festergut’s exhale? Kologarn’s Shockwave? Maybe some Instability? Divine Protection no longer causes Forbearance, so use it! Go find a nice, cozy patch of Coldflame and heal the raid while Divine Protection and Protector of the Innocent keep you alive. Don’t forget to macro /cackle.
Wait a second. You’re not getting hit in raids, are you? If you are then first make sure your tanks are alive (and awake) then consider an off-spec incorporating Blessed Life.