Hip Pain from running

I’ve been looking through your previous posts and Guru responses on hip pain but none of them exactly match the issue I’ve got.

I’m a 40 year old regular runner (typically 30km per week) and since the start of this year I’ve been gradually increasing my overall mileage and length of runs so that I’m now doing around 50-55km per week, as training for the London marathon. Just over a week ago I developed pain in my left hip after a week with a heavier load than normal – couple of runs where I pushed a bit harder (had generally been moving slower as I increased the mileage). This included a parkrun where I was leaping across big puddles rather than getting my feet wet and it was after the parkrun that the pain began. I first noticed that it hurt to lift my leg to work the clutch when driving and when I tried to run again it was painful to run, leaving me limping to walk afterwards. Mostly the pain is a niggle whilst walking and you can hear my hip clicking to walk upstairs / a bit of a grinding sound when moving it around and it feels like it’s right in by the joint / groin area.

Does this sound like something that simply needs to be rested or more specific physio needed? And is it something likely to be improved enough to run the marathon in 6 weeks?!

Thanks!