What Causes Sudden Problem In Child?

I know this maybe too extreme for this site but Im seeking all the advice I can get. Kayden is 2 months old the greatest baby ever (in our eyes) Sunday he was his normal self, healthy, happy,smiling. Monday morning I walked over to get him and noticed abnormal breathing inhaling but not exhaling. His body was solid gray (note hes african, Caucasian) and unresponsive. I immediately called 911. He was transported to VCU in Richmond Va.( Still here) He is in a coma, on life support,red blood cell count is dropping, fluid on his brain ,having seizures and his blood pressure was at 320 when he was transported. They have ran every test for major infections plus more and all comes back negative. The pediatric unit has never seen anything like this.They have contacted other specialist and there has been no diagnosis. If ANYONE MIGHT HAVE ANY CLUE OF WHAT IT COULD POSSIBLY BE PLEASE HELP ME. We just want him to come home and return to our happy lives.Thank you!