I felt chills and unwell since last night.
I think it's fatigue.
I took a fever reducer and arrived at the conference late.
I was able to hear my co-researchers presentation.
I had to give up on an afternoon project because of the fever, so I listened to the conference's keynote speech that afternoon.
My poor health has returned.
I had articles due the next morning, so I headed straight from New Chitose Airport to the university.
I managed to submit it, but I still don't feel well.