52 yr. old white male lost over 100 lbs in 8 months,1,swollen lymph node in groin ,biopsy in 5 nodes no malignancy.complete loss of appitite,extreme fatigue,all major organs look good ,2mm cyst on kidney, no fever, no elevated white blood cell, no sign of infection, pain in lowerleft side ,prostrate good,colon clear- no problem with liver, stomache, heart,gall bladder good cat scan shows nothing blood tests show nothing -1 1/2 year ago he went to mexico, he also took a cruise to mexico.9 months ago. he was also bitten by a dog last year, he lives in a rural area but it is not lyme disease.no diabetes,no high blood pressure. He went from 260 lbs to 162. are there any infectious viruses or diseases that have these symptoms. He looks like he is dying he can no longer work, for the past 2 months he has been back and forth to doc, he was in hospital 7 days still no diagnosis help!!!!