Concerned about Caden.

I just got off the phone with his 1:1 aide from school (on a Sunday night no less, she called me back, she is a TRUE GEM of a person). Last weekend and a few days previous Caden had a bit of a tummy issue, throwing up a few times over the course of 3-4 days. He never quite got over that, or at least never came back around fully. What we notice at home is that he is VERY tired, going to bed eagerly by 6pm some nights, then sleeping until 7:15 and refusing to stand up out of his crib and get ready for school. Normally he is hollering in his crib from 6:50am on, but this week he won't stand up, just wants to stay laying down and covered up. I mean, I liken that to being like his mommy in the mornings, but it's SO unlike Caden. He has also nearly fallen asleep at school, in the 100th day of school party at Kindergarten no less! He is also very irritable at home, downright defiant and aggressive at times. At school they're saying that he's increasingly loud and getting louder. To me, almost like he's trying to tell them something but can't convey it like he wants to, so he just gets louder instead of more articulate, which makes sense. He is also very pale, and his aide noted they have commented on that as well. I know, now you're thinking "anemia" and I have gone there, too, but I've also of course looked up things like HUS and now am slightly more concerned. (I might note here that I also looked up Rubinstein Taybi Syndrome over 6 years ago, alone at home with my newborn son and fell apart for hours, so sometimes the internet gets me into trouble.) I think it's definitely time for a call to his doctor in the morning. I know that is going to mean a CBC and other pokes for him, but it's time for some answers as to what's bothering him. He is not himself, and many of us are concerned about him.