dear user about your question i would like to tell you that severe fatigue you have may indicate underlying disease for investigation or may be due to stress .... stress and anxiety and sleeping disorders commonly cause that and should be avoided and you should observe any emotional or psychological troubles you have as it make you feel fatigue simply .... anemia and poor nutrition and low vitamins intake will cause these symptoms because anemia cause severe fatigue and hedache and should be managed if present... may be there is pathogenic cause so you need to do blood test and urine analysis and liver functions test and renal function test for investigation of any disease related... at last you shouldnot get severe worry of that and just follow these simple steps and try to relax your self and have some funny time to relieve of stress....... wish you healthy life