your mistake is cooking us in our own tears, which are infused with arcane energies, hence the arcane flavor. Location also makes a difference - if you were to cook us in the Dragon Soul raid, for example, it'd taste all Blood of the Old Gods-y.

Personally I recommend you bring a warrior and a paladin along to do the grill work. Have the warrior spell reflect one of our massive Pyroblast! procs which will give a nice sear, and make sure we're standing on Consecration to prevent any nasty bacteria/oozes from getting in.

you will need to make smart use of your CC abilities.
-you have a silence from the felhound. use it.
-you have death coil. think of this as another short fear that does not have diminishing returns.
-you have howl of terror. use it.
-you have fear. use it.

Kite the mage. You will be able to damage him while keeping yourself either a safe distance away or while he is running around. Keep haunt up on him. Remember, you can heal yourself, the mage cannot unless he uses a very vulnerable cooldown (evocate). Use demonic circle for a quick getaway.

Mages, like all classes, have a certain set of predictability when it comes to cc. Just learn the common tendencies that you can expect and counter them. Your pet and your dots will actually end up doing most of the damage for you. Your job is to keep that mage from casting something on you.