hi there-
i really don't know the answer for sure, but i wanted to tell you what i do know, just because i know how it feels when nobody responds to a plea for help (for example, see my posting 'necropsy/axolotl' below). so- i do know that axolotls, when ill, should be stored at lower temperatures. this lowers their metabolism, and lets their body work exclusively on healing itself. i don't know much about newts, so it might be safest to go with the vet's advice. my one piece of advice would be to not force feed it (assuming it's not emmaciated) and to never leave prey animals in there with it overnight/unmonitored. if it refuses to eat, maybe a lower temperature would be better, so it won't starve as quickly. if you must, (and this is a shot in the dark), maybe try mashing up some waxworm or other item, putting the goo in a very small syringe (maybe a 1cc or a 5cc size, with no needle), and injecting a small amount into its mouth. if this didn't work, as a last resort, i would probably try some watered-down chicken baby food, but only as a last resort. i hope my ideas helped some!
-marla