yea, 1v1 was never designed for shamans (shamen? shaman? what's the plural?)
Anyways, As elemental you've got to burst down your guy like crazy. What Tree said was an example, but it gets easier if you've got the right spec.
Nature's Swiftness makes alot of things go nuts. What I see in most pvp shaman cast sequence is a lightning bolt and than a crazy macroed chain lightning which looks like this.
/stopcasting
/cast 13 ----------> (activates your top trinket, 14 for the bottom, icon of the silver crescent for best results

)
/stopcasting
/cast Elemental Mastery
/stopcasting
/cast Nature's Swiftness
/stopcasting
/cast Chain Lightning
I think this is the correct macro, I'll have to check on it again. But when you use it, it'll activate your trinket, elemental mastery, nature's swiftness, and chain lightning all instantly. It's a good finisher in Arena's.
As for totems:
Casters you'll need grounding and searing totem. searing will help push back their casts and grounding is good. tremor totem for priests and warlock fears (nerf locks pls). Earth shock casts when you can, especially fear. Not much you can do about dots except heal through them for a bit. Try and trick them with gift of naaru first to draw out counterspell/spell lock, then go for Lesser healing wave.
Rogues, poison cleansing totem and earthbind. The key to rogues are mostly using instant casts if possible. Keep both these totems up, lightning shield up and shock him to death. If you can build some distance you can go for chain lightning. It's a hard fight against a rogue but if they get too low they can't touch you with your lightning shield up unless they use cloak of shadows or something that will help them resist magic.
Every other class I haven't had a whole bunch of trouble with except rogues and locks (nerf locks pls

)
That's usually how elemental rolls, but I use my drums of panic if they try to open on me.
But all are situational, don't try and blow all of your burst in the first second out of panic, especially if they've got good pvp gear. Bring them down enough that you can without using your cd's if possible while also staying alive.
Be aggressive or defensive when it's appropriate.
