This should really be in the Beginner section or the Macro section that said I am in a good mood so...

I would change your macros so that you don't have and
Code:
,Healing Wave,,
but rather
Code:
Lightning Bolt,Healing Wave,Lightning Bolt,Lightning Bolt
that way you have at least 3 LBs during your healing phase

Regarding your VW tank question, even from my measly level 29 I can say that NO you will not be able to tank effectively with a single VW without direct healing which will significantly gimp your DPS