At first I thought that it was a severe case of 'tennis elbow' caused by reaching into the back seat to pick the newspaper up but the doctor has now confirmed that it's potentially a bit more serious than that.
Of course when she asked when I had first noticed the pain up my left arm and across my shoulders, coupled with my inability to dress myself fully, hold anything in my left hand and generally feel pretty useless I'm embarrassed to reply 'about four weeks' so I lie and say 'about ten days'. I don't have a fear of doctors but a fear of wasting doctors time, thinking that they could probably seeing somebody with a more serious ailment than the one I present them with.
Anyway the current treatment is anti-inflammatory tablets, the link suggests some other possible routes of treatment but to be honest, and as the doctor said to me, with diabetes you are fairly limited in terms of choice. It's a real bugger though, just getting to that point where everything is running smoothly healthwise and something else comes along.