6 year old Mini Bern just diagnosed

My 6yr old mini Bernedoodle had 2 recent blood tests that showed high liver enzymes, so my vet did a low dose Dexamethasone test earlier this week which concluded he likely has Cushings. The vet is putting him on Vetoryl 30 mg 1X per day. He currently doesn’t really exhibit any noticeable symptoms, so I’m concerned how quickly this progresses as he seems a bit younger than the average diagnosis. I know I need to discuss further with my vet (and will), but so far I’ve only been able to speak with the vet tech over the phone as the Dr is out until Monday. The info I’m gathering online is concerning so I guess I’m just anxious to know what we are in for, and connect with pet owners in the same boat.