I have same situation and moved in recently from Dubai. I was a teacher there for 12 years. Though I had my upfront medical done before arrival but still have same conditions and nobody asked me about the medical report at the port of entry.
Now I have an offer from a school in Canada which I really want to join but I don't know if the process is same as these posts are couple of years old. If any of you have any recent experience, please advise at earliest. thanks