Like a canary in a mine

This morning they ran out of seats on the bus so I stood. Then suddenly I felt like I was about to pass out (dizzy, weak). I asked the guy sitting by me if I could take his seat because I felt faint. Then I did that whole put my head between my knees thing. People were probably thinking I had the swine bug. What bad timing to look ill. At least I didn’t puke like that lady the other week. I’m guessing it was because I was overheating or the air was too stuffy.