my grandson is 3 years old and has headaches, falls asleep and when woken up thrashes his arms and legs. He is now having diarrhea, won t eat, doesn t want to drink. Blood test have been done for mono, CBC, metabolic panel-all are normal. He is having an MRI of the brain next week. My daughter(his mom) has MS and her sister and I both have auto-immune disorders. What could the Dr be looking for?