Turns out I had damaged the superior trapezius muscle probably through picking up smallest (!) dgs who now weighs over 20lbs. Ultrasound plus deep massage pretty much fixed it in one session. I'm at physio every fortnight for other issues so she's been able to keep an eye on it. I've always had ultrasound treatment and sometimes interferential treatment which I believe stimulates the nerve function in damaged areas.
Anyone else not watching the World Cup


too. 

