Hi Lula-
I'm so very sorry to hear that Garry is having such problems. It sounds as if you have some wonderful help in Toronto and that Garry's case is being investigated very carefully. I think that is an extremely important step prior to surgery. I always feel much better when Joe's doctors do lots of tests and studies before they "cut". Investigation into a heart problem is, in my opinion, the most important step.
When all is over and Garry has his surgery, he'll feel like a new man. The good thing about heart problems is that most of them can be fixed up.
When I remember how terrible Joe felt prior to his last surgery, it's like an old nightmare. He's had some recent problems not related to heart, but those will eventually get better. His heart has felt fine from day one after his last surgery. His color has returned and he can walk now without breathlessness. All of the nasty heart related things are slowly disappearing. He can drive and has been discharged by the surgeon.
My thoughts are with you both in these tense days. Please remember that we all care and that Garry will get better.