He's 18 months and on Sunday developed a cough where he was coughing a lot and it making him turn red/purple at points. But besides this was good. Yesterday's a little worse and wanting cuddles, today a temperature, coughing up yellow phlegm, coughing so much he's vomiting and everytime he try's to eat or drink he coughs and chokes. My GP doesn't open till 8:30, he's been awake half the night with coughing too. What could this be?