Hello,
Welcome to Just Answer and thanks for your question. Your wife would need to see her doctor to determine what the causes of her symptoms are. Some viruses diseases like mononucleosis (usually caused by the Epstein Barr virus) can cause fatigue for several weeks to months afterward. A pulsating body and fuzzy head aren't usually parts of this recovery process though.
"Post-viral syndrome" isn't a specific diagnosis and can be another name for chronic fatigue syndrome or myalgic encephalomyelitis. Problems that go by the latter two names can last for years to as long as someone's lifetime.
Nurse Practitioner
Board Certified Nurse Practitioner, MS, RN. Private practice and hospitalist experience.