However it was that he made that clear, you didn't describe it in your original message so I was left with the impression that there was a lot of uncertainty. Therefore my first bit of advice -- the sort I would want myself -- was along the lines of "don't panic, wait for more info."

If you know for sure you can only see him this one last time (did he say that?) -- that's really awful. I would be very upset and anxious. I'm so sorry.