It would be better if I had an idea of what you mean. And how it relates to BTC. Are you looking to sue a Canadian Doctor for malpractice?
The first thing you need to do is contact the College of Physicians
https://en.wikipedia.org/wiki/Royal_College_of_Physicians_and_Surgeons_of_Canada thats their wiki, the specific links by province are at the bottom.
you need to bring their attention to your complaint. this is all part of the paper-trail you will need to proceed.
malpractice is tricky anywhere you need to prove it in court.
if the practitioner(s) really did a botch job on you and you can prove it, just get a good lawyer... both of you will get payed large.
proving it is the hard part. the "burden of proof"
i dont have any idea of what your actual complaint is though, so I have no solid advice other than reach out to the royal college of physicians and surgeons. they will give you advice on how you can proceed, if you should proceed, if you have any right to, and what you need to provide...
my friend lost an eye to cancer and he felt it was partly due to recieving the wrong treatment at first... but they told him all the medical history, plus history of specific treatment he had to gather... long story short... he had no grounds to sue, but the process put him at ease that there was no actual malpractice at least.
its not always as simple as "I went in for a tonsillectomy and they accidentally gave me a sex change" sometimes there's no guarantee in medicine. If the doc cant cure your cancer there's not much anyone can do... sorry
the college of physicians can help you though. good luck