Symptoms Sunday Were: Muscle Contractions, Pain In The Neck,diarrhea, Vomiting,

Symptoms Sunday were: muscle contractions, pain in the neck,diarrhea, vomiting, irritability, shaking, lethargic, dehydrated, may also had a seizure. They ruled out heart attack and can not figure out what is wrong. CAT scan came back normal. Do not know about the blood test results - but they want to release him from the hospital tomorrow but, they do not know what caused this. What can we do?