MY Symptoms Are: Cough, Night Sweats, Fever,boil Underarm,short Term Vertigo,

MY symptoms are: cough, night sweats, fever,boil underarm,short term vertigo, weight loss, fatigue, anemia, runny nose and high WBC count. What would be the first test I should undergo? I am a 67
year old male and have been extremely healthy all my life. These are all sudden onset symptoms. I do not smoke or drink, I have a fairly healthy diet, I have never been overweight, I exercise regularly, and I take no prescription meds.