Hi, my 3 yr old son has been runny a igh temp for 5 days now, he has been very tired and just not interested in doing anything, he perked up for the last 2 days but durin the night he woke up several times complaining his legs were hurting, then his fingers and arms. he was also burning up. He has a nasty cough too and in the night it sounds like a bark. He is really not himself and im quite worried. can anyone help in any way, that would be great thanks