(((Hugs))) for Jacob. It breaks my heart, too.
How did your Mom handle it? 911? Riley's diastat? Did they do an emergency CT scan and EEG? Or is that all going to be newly scheduled?
I agree with Wendy, in that I hope it's a one time thing. The headaches and behavior changes that preceeded it, give me a bad feeling...
Personally, I think your sister(?) (Jacob's parents) should mention the gluten troubles in your family and get Jacob tested for that, while all the other testing is going on.
(((Hugs))) and prayers.