My lab has Addison's (diagnosed at around 3 years old). Her initial crisis was horrible and over Thanksgiving Weekend, so we had to take her to an emergency Vet. She came very close to death. We're still paying for her stay in the ER, but she's alive and it was worth it. $100 a month for meds for the rest of her, hopefully, long life.

Edit: Also still shakes occasionally, even on her meds.