No helpful advice except to check the ingredients list on any packaged foods he may eat for something called "annatto" or "natural coloring 160b". If it's in anything he eats regularly cut it out completely for a week or two and see if the head-banging improves. This additive is apparently a common culprit for head-banging but often overlooked as it is "natural".
ETA: it's a yellow coloring - often in processed cheese, custard, fruit bars, yoghurts, but worth checking everything just in case.
Last edited by Shades; August 25th, 2011 at 08:19 PM.
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