How high is the fever?
Personally, I would ask for the tests you mentioned.
Didn't they do any tests during the first visit?
I went through something like this when my dd was about a yr old, give or take a few months, and it turned out she was septic w/ samonella. They kept telling me it was viral. After 3-4 days, I insisted on blood work, UA, etc. and that is when they found out (by this point she was in hosp for dehydration) and was kept for over a week. Blood work was done at time of admission and that was only because dh and I closed ranks and insisted something be done.
Big OOPS from the dr.
SJ
PS. I hate managed care!!!!!