Can anyone help diagnose 8 yo ds? Since yesterday he's been quite lethargic and saying his head is heavy. He's had a sleep this afternoon which is unheard of. I've just come to check on him as he's been having a rest and he's developed a rough feeling red rash on his cheeks. Pic included. I'm sure he's had something like this before and it was slapped cheek iirc? I've also felt very odd today but no rash. Just very sleepy and drowsy, dizzy and almost dehydrated-feeling although I know I'm not.