I am sorry to hear that! I am not an expert or anything and this may have nothing to do with your son. I just wanted to mention that I have eczema & every time I have my blood drawn my white blood count is low. They told me that is normal if you have any type of rash, illness, ect. So they chalked it up to my eczema. Not sure if this helps you or not. But I thought I'd let you know that.
If the regular doctors cannot help you I would suggest you check out this website: www.maxhealing.com
My prayers are with you and your little man.