my six year old son was complaining of leg pain wednesday , thursday he was sleeping all day on the couch and had a fever and headache and coughing all day. Friday he woke up and said he felt fine, he acted fine all day in the evening he started getting fever back and laying down, still complaining of leg pain here and there...then, yesterday morning he got a nose bleed and again this morning, he said he feels fine today again but I think by this evening he will not be feeling well agian, any ideas? I am concerrned about the odd nose bleeds and leg pain.