**BUMP**
I know from my own experience that being anxious/nervous raises bg levels, some years ago my sister had gone into labour, on the same day I had an exam to pass, I was a nervous wreck, lack of sleep, etc, I had normal breakfast, was 11.2 (in the days before low carb) 2hrs after, left for my exam, had nothing to eat at all, could hardly see what I was writing my vision suddenly blurred and I felt very ill with the stress of it, I tested my bg had shot up to 17.6.
Finished the exam though and passed with flying colours too,went straight afterwards to a cafe, tested, now exhausted but relaxed, bg level had gone back down to 9.8, I had no medication to bring it down.
If your husband had a bad experiene to cause anxiety he can still feel the after shock, whether he is diabetic or not.
I hope he feels better soon.