MacroMan-
I'm sorry to hear this diagnosis, but welcome to our lousy club. First, I want to assure you that this is probably curable and that you have plenty of time - several months - to explore your options and make a cool-headed decision.
Yes, it is very common for Gleason 8s to be stage T1c. The stage just means the doctor didn't feel any lumps when he gave you a DRE, and that is by far the most common staging across all risk categories. It's especially unsurprising given that you had only one positive core.
The first thing you'll want to do is to confirm with the best second opinion available that the Gleason scores are correct. That would be Epstein's pathology lab at Johns Hopkins. Just call your urologist and ask him to send the slides. It will cost you $250US but is well worth it.
I hope you will read the sticky for the newly diagnosed - it explains the terminology and the basic options.
You have several treatment options
open to you, including surgery and several different kinds of radiation. I have come to believe that for high risk men, brachy boost therapy is a superior option to all others in assuring a lasting cure. This article explains why:
/pcnrv.blogspot.com/2017/03/brachy-boost-gold-standard-for.htmlI notice that you are in BC. The Vancouver Prostate Centre is excellent and has some of the best doctors anywhere. In fact, they were the ones that established brachy boost therapy as the new gold standard for oncological control with their ASCENDE-RT trial:
/pcnrv.blogspot.com/2016/08/external-beam-radiation-therapy-ebrt.html