12 Hour Fever What’s going on?

Patient: I felt weakness with an oncoming fever episode at about 12pm. My body was extremely weak and my face was really hot 8 hours in so i took some dayquil and went to take a nap with A/C on. I woke up 2 hours later and the fever was pretty much gone and i felt fine to eat a large meal. I woke up the next day and the fever was gone.

Symptoms: Fever, Swollen lymph nodes

Doctor: