Hi..
Thanks for the query..
As per your complain it seems that your son is suffering from viral infection leading to
low grade fever, cough, chills and body aches..
Whitish tongue and bad breath can be due to yeast infection of tongue known as
Oral Thrush and the cause is low immunity due to infection and also a major cause is Albuterol inhaler that is a steroid inhaler and steroids oral or inhalational are common cause for yeast infection or oral thrush..
I would therefore suggest you to consult a Paediatrician and get him evaluated and a thorough clinical evaluation and investigations like
blood test and microscopy of scrapings from the tongue can help in diagnosis and treated accordingly..
In case of thrush he can be advised antifungal
mouth rinses and lozenges like Candid mouth paint and
Clotrimazole lozenges to resolve thrush..
Also always make him wash his mouth thoroughly after taking inhaler..
Make him drink plenty of water..
Give tylenol to reduce fever ad Ibuprofen for pains..
Hope this helps..
Regards.