A Devon dad has spoken about the rare condition that saw his "happy and relaxed" son become aggressive, anxious and even lose fingernails.
Neil Gilson&apos;s son Jack was 18 months old when his parents started to notice a dramatic change in his behaviour.
Jack, who had been "developing normally" until this point, suddenly developed tonsillitis and became very aggressive overnight.
For more information about the conditions visit the PANS PANDAS UK website.