Hi
I think the short answer to your question is that nobody knows at the moment. I would think that if your husband's scan is going to be cancelled you'll hear really soon as it's in 5 days time.
You could post this in the stomach cancer group and see if others there are having their scans cancelled.
Keeping my fingers crossed that it goes ahead 
"Never regret a day in your life, good days give you happiness, bad days give you experience"
