It's been like it for a few weeks and I was hoping it would just go away and that I had probably simply pulled it.
I'd just like to point out this isn't blokey behaviour at all. Finding a pain in a joint or muscle that is uncomfortable, but not debilitating and isn't the result of an acute injury (eg a fall), the correct behaviour would be as you have done. Waiting to see if it rights itself - as they mostly do - before bothering the doctor.
Blokey behaviour - and this is a true story - is a friend mine who went to his GP with a nagging cough, and was referred to chest specialist. He didn't go for a year! and by the time he did, the (fortunately benign) tumour had grown so large that when they cracked his chest open, they found it was impinging on his spine and was inoperable.
He's still alive, you'll be pleased to hear. They shrank it with radiotherapy, and for a long while he thought he couldn't have children. Luckily that proved wrong.
Anyway, I'm also curious of the diagnosis and how the physio goes.