What kind of a Dr are you going to? have you tried a rheumatologist? Alot of your symptoms sound like my daughters, falling down, dropping things, light headed, fever. The white blood cell count I don't know for her but it is an indicator of infection like Julie said. It is not "nothing". My daughter was dx'd with Mixed Connective Tissue Disease & Rhuematoid Arthritis. MCTD is a combo of Auto Immune Diseases. She has Lupus, Polymyocitis & Sjogrens along with the RA & Fibro. Once her immune system was supressed, she has felt so much better. Auto Immune diseases can cause all of the symptoms you are talking about
so that is one area to look, along with those your Dr is looking into now. If your Dr isn't giving you the help you need then find another who will. Never stick with a Dr who isn't trying to help you. Do some research yourself on the internet.
I am sorry about your son, how sad that must have been for you. Maybe once you get dx'd & on the right meds you will feel well enough for him to come home. I will be praying for you. Never apologize for the length of a post, it is never too long & you were not going on & on. You were reaching out & I hope we can help you in some way, even just to let you know that we care. Hugs, Denise