In my opinion, there really isn't such a thing as a "healthy" dry food (Species-Inappropriate: The Dangers of Dry Food
). That said, I wholeheartedly second & third the previous suggestions - feed those poor girls whatever they will eat!
After a couple of days eating regular meals - whatever they are - you can begin transitioning your cats again. Some folks go right from dry to raw, others go from dry to canned to raw; it all depends upon the tastes of the cats.
This article will give you some helpful tips for transitioning, whichever way you chose to switch them: http://www.catinfo.org/docs/Tips%20f...2012-18-09.pdf
Take the transition just as slow as your kitties desire, but don't make them go hungry (crazy that the vet said that *shakes head*), and don't actually mix the kibble with either the canned or the raw, as kibble has a great deal of bacteria that will grow very fast once it gets damp.
Things that might tempt your furbabies to eat are: freeze-dried 100% meat treats sprinkled over the foods (Whole Life makes several flavors that never fail to entice my cats to eat), Parmesan cheese, bonito flakes, the juice from cans of water-packed, no-salt-added tuna and sardines, catnip, and strangely enough, flaked fish food.
The very best of luck to you!!! I'm so sorry you're having such a scary time. <<<<hugs>>>>