My 6 year old son (54 lbs.) had a cough x 4 days, fever (101.7) x 2 days, sore throat, and fatigue, and loss of appetite; now the fever is 99.4, sore throat and his tongue has turned a thick coating of gray . He has no rashes, and had a tonsilectomy in March 2011. Does he need to see urgent care tonight?