What would be the most LIKELY CAUSES for the following symptoms in a
healthy adult male in Canada:  dizziness, blurred vision, nausea,
vomiting, lack of appetite, diarehea, RAPID WEIGHT LOSS (20 lbs in 4
days), extreme weakness, very pale complexion, mild fever.   Rule out
cancer, drugs
or medication of any type, as well as depression.    Rule out common
diabetes for now, (type I and II).  

Hypothetical.  Question is academic, no information will be used
without consulting a physician first.