I'm not sure what your vet is saying, but whatever he's been telling you is pretty much,
the same old stuff you can read off any internet about how to feed your bearded dragons.
IMO, this vet is just claiming heart failing, and blood clogs around the eyes. It could very well be a genetic thing,
the eyes are definitely bulging, and a better diet is the way to go regardless. I still don't believe
that diagnosis was worth the trip, you could easily have saved that money for better lights, cage fixtures, or
something else.
You should check your temps and starve it until it eats a proper diet. That is what it always need, the light, food,
and exercise. You should make your dragon more active so its heart strengthens. My dragon fell from 15 feet and is
fine, if I had took it to the vet, they would have wanted to give it some shots, xrays and a bunch of fees to make it
worth their time.