Our expert says:
Difficult to diagnose, obviously, without a proper examination. Might be weakness of the hip flexor muscles causing some instability in the bone. It's probably inflammation, because it doesn't sound like it hurts during the run (or it didn't until this one). I would imagine the brufen works quite well. That said, I wouldn't stay on medicine too long, because it's only really dealing with the symptoms, and you need to figure out the source.
And the source is likely strength or flexibility. It could be a leg-length imbalance, hip flexor tightness, weakness, any number of things. I'd suggest you see someone about it, a doctor or physio, or a biokineticist and have them assess and identify the problem now. Otherwise you're right, it will be recurring and hold you back!
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