My S3 warlock sais that with 4 Felhunter Pets on druid, with /castsequenced Spell Locks and Automatic Devour Magic, the druid isn't going to have any HoTs on him, or will be getting a casted heal off. Drain mana x 4 + Mana burn x 2 = 5-6k mana gone in 5 seconds. Don't bother putting Curse of Tongues on a single druid.

The rogue, however, you will not be able to deal with until you get a couple hundred resilience. Most geared Rogues owned my shaman when they were 70 wearing their crappy greens. Shaman have an easier time outlasting Rogues, as they can at least heal themselves while the rogue uses CoS.

I have more advise, but at the moment, it is just your lack of gear. Locks specced for Demo or Aff have always been a class that simply needs to outlast the opponent to win, and you just don't have the gear to do that VS geared opponents at this point.

I would concentrate on AV and EotS, to spam Seed of Corruption vs groups, or the regular dots vs single/duos. Always use Felhunters. If you are feeling too squishy to have any offensive capabilities, respec Soul Link to use with Fel Hunter (24/37/0). This still gives you siphon life, but you lose Instant Howl of Terror. But you have your priest for Psychic Scream.

Another thing (maybe something you haven't looked into, I don't know) is that you can purchase blue PvP gear from vendors in Shattrah, Cenarion Hold in Zang, Thrallmar in HFP. To get all the pieces you need to be honoured with Keepers of Time, Cenarion Hold, Thrallmar, Lower City and .....something else (whatever rep from doing Tempest Keep instances in Netherstorm).

Either way, Brad, I think you are doing fine, and have just had an unfortunate week. I still run into duos that shut me down if I don't blow cooldowns (S3 disc priests ugh). Easy to farm things that might help is the above mentioned rep for easy PvP gear, 50 Spirit Shards to turn in for the Epic Ring with resilience, AV.

In instances, use your fears more liberally. Pull mobs back a ways and feel free to fear them. Pulled back far enough, they won't run and agro other mobs. Set each Warlocks focus to an individual mob, and that is 4 mobs you can neutralize while they take damage.

PM Mudd and take advise from him, as he has managed with 5 warlocks to attain some instance gear at 70, as per their armories.

Good Luck!