Hello Hitesh, Welcomeme to HCM! After reading your question I found that there are two main things- first: your father is having high grade fever (duration is not mentioned), and second : WBC are raises. Both these points towards possibility of an infection in his body (you have not mentioned any other symptoms like cold, cough, or burning urination etc., so I can t pin point the cause). Because of fever and infection itself, the appetite goes down for some times in many patients and they can t eat. Due to high fever he must be feeling weak and so, keeps on lying in bed. It is a common presentation, and I don t think that you should worry much. You should take him to a doctor and get him checked, he might need some more blood test to find the cause and place of infections. Had I been your treating doctor. I would give him a trial of antibiotic and and antipyretic. For time till you take him to a doctor, I can say from my experience that fever should subside with tab. paracetamol in dose of 500mg, and can be given two to three times a day for two days. But I would suggest you to visit a doctor in person and get your father checked. Hope this helps you. Please feel free to ask anything more for clarification. Dr. Manisha Gopal