Chils,knee ache,back ache

Patient: I had the chills . About an hour or so later I had aching behind my knees. This aching moved up to my lower back another hour or so later.After another hour or so I threw up, not a lot. After an hour nap I feltbetter but still not great.I drank a lot of water and some gatorade which helped. I also have had a headache. Now after 2 days I feel fine, but haven’t eaten too well yet

Doctor: