My little boy had the MMR booster jab 9 days ago and ever since he's been unwell. Started with a swollen arm and high temperature the day after the vacination. Since then his temperature has been up and down every day and he's progresively getting worse. the last few days he has developed flu like symptoms, runny nose, temperature, sore throat, red ears and a cough. Usually when hes unwell he will play but this time - totally wiped out. Had him to the doctors yesterday and he said to bring him back next week if he's no better and was given antibiotics. Has anyone else had a similar experience? I so want him to get better - never seen him so bad!