dear user these symptoms of high fever you mentioned refer to having underlying disease caused by bacterial infection or viral infection ....you need not to worry as the most common cause is viral infection and so we dont need tobe stressed and just follow these simple steps.....you should take antipyretics and drink multiple fluids will help then improvement will occur gradually if the cause is viral EBV indicated so treatment with antiviral drugs will help if symptoms persist or get worse we suggest that there is bacterial infection and antibiotic indicate now you should do some investigations to detect cause as widal test for typhoid ,urine culture for possibility of uti ,blood test if any other symptom you feel you should examine that with your doctor consultation as it may help alot..... stress and anxiety can cause increase these symptoms wish you healthy life