For a few days my DD 20 months has had a little cough. Last 2 days' its turned into a real hacking cough complete with runny bum, streaming nose and eyes but she's been her usual happy self. Today she's totally lethargic, and keeps rolling her eyes, and squinting at light. There's no rash but there is a bit of a temp. Is this normal or do I run to A&E like the panicky first time parent that I am!