A.F.
Mono requires a blood test. I had mono when I was 18, was misdiagnosed as a sinus infection, given a antibiotic to which I had a funny reaction to (my face swelled up and I needed steroids to bring the swelling down). When I got a fever that would not go away and was so tired, AND they found the swollen knot gland at the back of my neck, they did the mono test (at the ER). Worth getting the blood test. There are certain activities you should refrain from if you have it due to spleen swelling and transmitting the virus.