Hi Countrybumpkin
Well done for calling the appointment line to see what was going on when you didn't receive the expected call. It's a pity that they didn't take the time to inform you that it had been cancelled.
I assume your interview has been cancelled because they have sufficient information to make a decision, and hopefully, the outcome will be a positive one. I can understand why you're worried - but there's nothing you can do now but wait for the decision. I know it's easy for me to say, but try not to make yourself ill over what the doctor might or might not have written, especially when you don't know when the decision letter will arrive.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems