Even my previously aloof sight hounds became anxious and needy towards the end of their lives; following me everywhere, pacing and panting and a burden to themselves. I started to crate them more frequently to give them a break. But I was never able to calm them. Sorry you and your dog are going through this.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015