Wednesday I didn’t go to Vespers because I had a very sore throat and a bad cough (the sore throat has gone away, but the cough hasn’t). I felt better Saturday, and sang at Vespers.
Sunday, it all hit very fast. My throat was full of phlegm, but I got through reading at Matins (largely because I can choose my own pitch, and I was fine on the bottom — my voice was cracking like a 12 year-old’s around g or a at the top of the bass clef). I was feeling weaker as time wore on, and I began to chill while we were singing the Beatitudes — wearing a winter wool 3-piece suit; toward the end, I had to drop out because my teeth were chattering.
The waves of nausea hit before the Cherubikon, and I do mean nausea. I was fighting it down and had to leave, from the kliros at the front of the church. It was somewhat embarrassing after the fact, when the nausea had dissipated and I had time to reflect, but probably best overall (hurling all over the church is not the best thing).