Twice now my son has had episodes of nausea, headache and vomiting, especially on lying down. The first episode seemed initially to be associated with generally feeling unwell so we put it down to one of these 'viral illnesses'. However the 2nd bout didn't seem to fit into the pattern of 'a bug'. As you can imagine I was getting very concerned so thought to pnone a colleague. As I presented his case to her, nausea, headache, neck pain the week before (actually a really sore neck having been involved in a fabulous singing and dancing project at school) I realised that actually I'd seen all this before. It's not that uncommon for neck problems to cause a feeling of nausea, there are several neurological pathways which can be implicated. I have in the past treated many people with neck symptoms who mentioned feeling ill and others who were quite handicapped with the vomiting that accompanied their neck pain. My son has a record of childhood/teenage accidents a recent collision had resulted in a fine clattering of heads, luckily no concussion to my surprise. However he had been most unwilling for me to check his neck after (well what would I, his Mother know about anything)
Of course with your own family it is difficult to be objective and a decent case history is rarely done, but oh reader, the guilt when after one treatment he stopped being sick and after 2 more the neck is not better but well on its way to soundness. Of course only time will tell if the neck truly is the cause of his symptoms, resulting in time off school and the misery of not seeing his friends, but at least his neck will feel better.