I am sorry I called Tessie the wrong name.
I am glad you got her to the vet because it sounded like she was in real trouble. If she has gone addisons it must have been the vetoryl and makes me wonder about the testing that confirmed cushings. Sometimes getting a correct diagnosis of cushings in all it's forms is hard to do. Once the Vetoryl wears off and the injection should speed things up you should see a great improvement. I would not be starting Lysodren or Vetoryl again until you get some more testing done. If Tessie stays addison then you will have to medicate her for that.

Jenny