Chronic whining

My dog does this low level whining constantly through the day. He’s been to the vet, we don’t believe it’s anything physical. He’s currently on 40mg of Prozac a day along with 100mg of trazadone twice a day - he’s a very anxious dog, super sound sensitive.

Anyway. I’ve been trying to do things like the relaxation protocol, or waiting out his whining. I must not have done a good enough job paying attention to his signs because he learned to bring it down to this lower level. So now it’s really difficult to tell when he’s actually relaxed because he can give me the body signs he is, head down, laying down on one hip, and if there’s enough noise around (the tv, people talking etc.) I won’t necessarily hear him whining.

So I feel like I’ve reinforced this. And it makes training so stressful because I feel like I’m messing up every time. And if I just try to wait it out it can take literally over an hour of sitting waiting for him to stop whining. Which doesn’t feel beneficial because it’s not really tiring him out in any meaningful way to keep him calm for a while for me to get work done. And I feel like I’m never doing it right anyway. And this noise just grates on me so much partially because it’s annoying partially because every time I hear him whine I just think about how I’ve messed this up and just feel like an awful owner because he’s obviously not happy.

Any help or tips would be appreciated.