I can't speak for your Canuck docs, but here in Cali I discussed getting my medical mj card with my regular doc. He's totally open to the idea, but has informed me in no uncertain terms that he will not do anything to jeopardize his license, and that means he will not risk tangling with the DEA.
You need to do some research, and make a list of pros and cons of the Rx's available to you (like Zoloft & Prozac, both of which can have some heavy side effects) versus mj, which does not have the side effects (ok, except the munchies which equals weight gain). The information for use for depression is out there I think.