My dd 8 had chickenpox 3 weeks ago. Felt achy, had the spots nothing too bad. She went back to school after 1 week, all the spots had scabbed over and said she felt fine. But she's still really tired. Friday night she was crying, just said she feels so tired and not right. This morning has a headache and tired. Is this normal after chickenpox? Could it be a post viral thing? She's normally very energetic but now she's just very tired and emotional all the time. I'm not sure what to do!