I've taken a few digs over the years,comes with the territory of being a regular drinker in a big city for 20 plus years. On the odd occasion it has happened it's rarely been random,usually down to a misunderstanding or a disagreement involving a friend. Lots of it is bravado but I think you've gotta stand up for yourself,if you throw a few digs back,especially if it's someone you're likely to bump into again,there's much less chance of it happening again. A guy I had a disagreement with a few years ago (along with a few of his burly friends!)realised I wasn't a soft touch,next time I saw him we were fairly civil,shook hands and agreed it would go no further,if I hadn't have fought back I think I might well have been attacked again.
I didn't but I was probably just being overly cautious by going to the doctor and maybe as it was in the early stages the increased mileage helped to build the muscle back up anyway and sort of cured itself. Someone with expert knowledge may come along and say that's a load of rubbish though! This might help:
I was referred to physio just as a precaution really when marathon training,was told I had patella femoral syndrome caused by under developed muscle on one side and over developed muscle on the other side of the knee cap causing it to be slightly out of position. AKA runners knee,was given some exercises to do such as leg raises,calf stretching and some resistance band exercises,apparently my really tight hamstrings weren't helping,but tbh it seemed to sort itself out. The physio did say it was at a really early stage but seemed able to diagnose it straight away. I went to my GP,was referred to physio and was seen within a month,all on the NHS.