When you see the Cardiologist, they will order a CT angiogram. Pretty standard treatment to do yearly to monitor your aorta. You said that you were already on cholesterol and BP meds. They are usually ordered with an aortic aneurysm. I was diagnosed in September with a 4.2 cm dilation of my aortic arch and ascending aorta and started on low dose Crestor. My next cardiology appointment is April 1 and I'm going to ask about BP meds, as many in this group were prescribed them.
The initial diagnosis is pretty frightening and especially so for you, as of what your brother has gone through. They may want you to do genetic testing.
The changes I have to make in my life are no NSAIDs, no fluoroquinolone antibiotics, no lifting more than 25 pounds, try to reduce my stress, monitor my BP. I'm not overweight and I've always eaten healthy, so no changes there. They will probably reduce your caffeine.
I'm glad I have the diagnosis, so I can make the changes I need to. The research I've done says that they usually grow slowly. I'm 70, so I hope they are right and I never have to have surgery. If I do, I hope it's after they have developed an easier way.
My advice to you is to read the comments on this blog, do some research and write down all.your questions to bring to your cardiologist. I am more at peace with my diagnosis as time goes on. This blog is helpful for information and support.
Sending prayers and well wishes.♥️