My father , 75 years had viral fever going upto 103-104 F , given antibiotics for 10 days , fever came down. but still is getting fever around 100F on everyday basis since last 25 days, we have done several tests , nothing came, finally did PET CT Scan, shows some swollen Lymph in the lungs (4cm size). Doctor advised biopsy but he is too week and everyday getting weeker . Is there anything we can do to bring his fever down and get him some strength so that we can get his biopsy or any other tests done in a week or so.