Hello, However, tiredness usually occurs due to generalized poor health, anemia, diabetes, thyroid problems, chronic fatigue syndrome, lack of adequate sleep, stress, depression & anxiety, an early sign of pregnancy in females.. Get physically examined, get total health check-up done. Nausea is usually due to acid reflux, migraine, liver dysfunction, dehydration or excessive tiredness. Get evaluated, get treated. Your treatment will depend upon the illness detected. You can take anti-emetics, antacids & vitamin supplements to feel better. Stay away from addictions if any. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Nupur K, General & Family Physician