Something that's helped my survivability to an insane degree:


1) Get a unit frames addon that lets you sort alphabetically. I recommend Pitbull.
2) Make a set of 4 macros on each character and bind them to keys. I use F5-F8.
/cast [target=Nameoffirstcharacter] Lesser Healing Wave
/cast [target=Nameofsecondcharacter] Lesser Healing Wave
/cast [target=Nameofthirdcharacter] Lesser Healing Wave
/cast [target=Nameoffourthcharacter] Lesser Healing Wave
3) Profit - this method is more reliable than a daisy chain of chain heals, because the cast time is lower (insanely low with bloodlust on) and heals more. A quad lesser healing wave is enough to get any of my shamans a full health bar.

The reason you want to sort alphabetically is because that way they're in the same positions in your UI at all times. I've found that even if you create the characters in order, in Arena the UI uses a different order, one that I have not been able to figure out to date.