a little somthing to back up what i said..
heres one of Void star..
http://img33.imageshack.us/img33/8130/screenshot2011122719315.jpg
And Civil War
http://img834.imageshack.us/img834/3440/screenshot2011122820233.jpg
both 300k + healing per round. @ 50
i would not recomend leveling as a healer it just takes 2 much time. + Along the line u get to some class quests where there are Healing NPCS u have to fight and with just your comp and your dots its a bit rugish.
My Current lvl 50 heal spec "Mind you i'm 99.9% Pvping"
http://www.torhead.com/skill-calc#201hGrRrdrkhzZf00MZ0M.1
Here is the spec i used to lvl
http://db.darthhater.com/skill_calc/sith_inquisitor/sorcerer/#::f3ef4ef2e3fe2f22e2fefefde10:
I put all my points into madness 1st then moved up the Lighting tree. i died maybe 3 times from 1-50 to NPCS Always used a tank pet. Khem untell 45 then Xalek
Hope that helps