There is not alot of info in your post, but with arm pain and neck pain along with dizziness and fever, your fiance should be consulting with a doctor ASAP who can make the call after running simple steps to check for heart problems or stroke problems
Wishing you the very best
I completely agree with the above poster. Your fiance needs to get to the Dr. When ever you have these kinds of symptoms you should not wait. It could be anxiety, yes. He should not take the chance though.