Dr Chronic.
I find it strange that you cannot get the name of a doctor to sign your papers.
So you need a Doctor that is taking patients.I hear that Health Canada is cracking down on Doctors who sign for people who are not their patients . They just charged Dr. Krammer ( I believe that's his name) in Toronto.

I have never had a problem here in B.C. getting a doctor to sign.My family doctor in Van.signed no problem and then I moved to Vancouver Island and got a new family doctor who also signed my papers with no problem.
If there is a way to contact you let me know. I can phone and see if my Vancouver Dr.is taking patients because he wont sign for you unless he is your doctor.
And he is a great guy.