I assume you're running 5 shammies and not 4 + separate healer?

Your gear is really bad. There's a lot of quest & BOE blues you can get that would be a significant upgrade to what you have. Have a look at my guide here:

Stealthy's Elemental Shaman Gear Guide for Northrend (Horde)

Also I see your exalted with the Warsong Offensive - which means you can get this shield - http://www.wowhead.com/?item=38462 and this head enchant - http://www.wowhead.com/?item=44702 - both of which would be a significant upgrade to you.

Cheers,

S.