From your description I had thought you were Blood from the HS's, but your Armory shows you as frost.
For a Frost rotation, Single target: IT, PS, BS, BS, OB (runes refresh or Empower Rune Weapon on bosses) OB, OB, OB. Rinse and repeat. I generally only Frost Strike when I'm capped on RP, or if KM Procs after the first one I'll usually eat up the KM proc with a second FS. Don't use Death Coil as Frost, it's inferior to Frost Strike. I tend to only Frost strike once to ensure I have the RP for Rune Strike, and Death Pack incase something goes wrong and I need to spot heal myself.
For AE threat: HB, DnD, BB, Rune Tap, BB. From here on out I generally just keep Howling Blast and BB on Cooldown, saving my runes for HB if it's almost refreshed, otherwise Obliterate hoping for Rime procs. The only time I ever use PS > Pest is on Onyxia whelps since the extra damage will drop them a bit quicker.
You might check out a spec closer to this: Talent Calculator - World of Warcraft
Frost really doesn't need epidemic, and you'll gain additional aggro from the extra 2 points in Bladed Armor.
I'd also consider switching out the glyph of Icy touch. Either for Frost Strike (more threat) Dark Command (resisted taunts, your hit is a bit low) or Unbreakable Armor.
For your runestrike macro it should look like this:
/cast Rune Strike
I personally put a /startattack in before the Rune Strike, incase I'm fighting a pack of mobs and I'm mashing an attack but don't have the runes to execute the attack, it'll turn auto attack on for me.
Make a macro like that for every ability you use. Know which ability you're going to use next in your rotation, and tap that ability as your runes refresh. This will make sure you activate Rune Strike every chance it's available.
If you are indeed blood, and your armory is misleading your rotation should look something like this.
IT, PS, HS, HS, DS (runes refresh, ERW on bosses) HS, HS, HS, HS or, DS, DS, DS if you need the heals.
for AE threat. DnD, IT, PS, Pest, Rune Tap, BB. Keep BB's on cooldown, and diseases spread.
Hope this helps.