[Nightblood.]

First, you don't have to "seem sick" to be sick. You can tell them that you were sick and they shouldn't know if you were or not. And they probably just didn't call your name for attendance because they knew you weren't there. If anyone asks if you were one of the two you can tell them that you weren't. If you're upset that the teacher made that comment you can try to talk to him/her and say that maybe in the future it'd be better to not mention it (I'm sure the intentions weren't negative, probably trying to make it easier for everyone to relate).