I think most people here would agree that we are experts at listening to owners who need to waffle on while they come to terms with a new worry. We have all done it at some time.
Is Bertie insured? It may be worth asking for a referral to a cardiologist.
I have received an email from you & I will be sending the information you want tomorrow.
Cavaliers......Faith, The Ginger Tank and Woody.
Japanese Chins.... Dandy, Benny, Bridgette and Hana.
Remembered with love......... Tommy Tuppence and Fonzi