Hi there,
I have endometrial cancer, but the systemic and radiation route follows surgery just the same.. I was unable to get radiation since I have already had my life-time dose. I'm in Canada too, and I know how our medical system is so backed up. However, in my experience, I started post-opp treatment at the designated time--6 weeks after. You can't undergo therapy before you've healed somewhat.
As for going to the Mayo clinic, or any US clinic, you'll have to pay big time. If you're flush by all means check them out. There are good cancer clinics in other parts of the US- e.g., Seattle and Texas.
Have you thought about getting a second opinion? Or enrolling in a clinical study here? Ask your oncologist about it. They're free to volunteers.
Hope this helps and eases your anxiety. I am anxious too.