Can you die from problems breathing and fever?

Yes... Difficulty breathing can be due to very serious and even life-threatening disorders. Some of these disorders also have fever associated with them. If a person is short of breath they need to see a doctor urgently even if that means going to the nearest er.
Maybe. Depends on the cause, but some people die from the flu, which can cause problems breathing and fever. Shortness of breath always needs medical attention, its a serious symptom.