Dear Welcome to HCM We understand your concerns I went through your details. For a 6 year old, the usual problem could be psychological. He could have learned some alarming information about such disease conditions. In that case, this problem could vanish within some days if you ignore his complaints. Otherwise, you should consult a neurologist through your child specialist for further advise. If you still need my assistance in this regard, please use this link. http://goo.gl/aYW2pR. Please remember to describe the whole problem with full detail. Hope this answers your query. Available for further clarifications. Good luck.