He has had episodes of a sever headache and then vomiting. The next day he is fine. No fever or other symptoms. I know it's happened when I forgotten to give him his medicine at least twice. Then today I forgot again and gave it to him around noon. (He usually takes it around 5am) then around 8pm he complained of a headache and within 30min he started vomiting. Does anyone know if this could be related to the missed doses or late. I really try hard to make sure he takes it everyday but I do sometimes mess up.