Hi Richard: This is Gareth Parry from the Medical Advisory Board. Sorry I did not reply to this sooner. This is an unusual symptom and I am not sure what is causing it. If one interprets the symptoms as pain there are lot of options such as amitriptyline, nortriptyline, gabapentin or pregabalin. It is early days; only 6 months out at the time of your question so hopefully it has improved and will continue to do so.