My 22 month old has had a runny nose for 8 months.It started after she began creche and went on cows milk.She only goes to creche 2 days a week often no more than 5/6 hours.DH and I are both self employed.She has had 4 courses of anibiotics and also am trying homeopathic stuff.It is often green.She is otherwise happy confident and eats well.Please advise