New to this

Hi My doctor told me last week that their is a 90% chance that I have lung cancer, I have a large mass at the bottom of my left lung. I am seeing a thoracic doctor today and don't know what i should be asing him, or what he should do for me, where do I start. They have been trying to find out what is wrong with me for 5 years, I am overwhelmed by all the info I found on the internet. Please any info would be greatly appreciated. I  live in a very small city, should I ask him to refer me to a larger city in Canada. Desperate in Canada Regards