As a healer, buff and prepare to cure bomb the tank when you see triple. For orbs just stand in the middle and play goalie; get the ones other people miss and toss out some cures/buffs. After all the orbs he's gonna hit you with an AoE, so heal/buff your party and prepare for another heal. For meteor phase focus on healing tanks and eat any meteors that come close to you, but don't run across the zone to grab one.