I suffered with hip discomfort for around 4 months, just running through the pain and resting for a day or so when it got really bad. Then one day I was out for a run, after running downhill I was suddenly in crippling pain and couldn't walk never mind run. I hobbled home, rested for a week and started over. The pain kept coming back, this time worse and much quicker than it had previously,plus it started going to my knee.
A friend of mine recommended an osteopath, who after about 30 mins of questions, examinations etc told me I had been overdoing it, the muscles supporting my hip were knackered and couldn't support my leg when I ran, so my pelvis was rotating to compensate causing my leg to bow and the pain in my leg.
Another half hour of treatment later to realign my muscles correctly, loosen everything up - and he worked all the way from my back down to my foot as apparently it is all linked - I was given five sets of stretches to perform 3 times a day. And no running!
A week later and apparently it was much better, I was allowed to do two 15-min runs that week on grass only, on the flat. And I had to do two sets of 15 lunges once a day to strenthen my hip muscles. Just done the first run and hurrah - no pain!! Apparentlyit should only take a few more sessions.
I am sticking to the orders very strictly, as a friend of mine had a similar injury and didn't rest it, and now cannot run at all - don't want to end up like that.
I would NOT recommend running through the discomfort, as it will soon turn to pain. See a professional - by recommendation if poss - and an osteopath is often the best way as instead of just concentrating on the site of pain, they work through the back to the foot etc to resolve the problem. I pay £35 for a session, but for 4 to 5 sessions it is worth it. You'd spend £100+ on a good pair of trainers, but if you can't run then they're no use.
Forget doctors, NHS doesn't want to know or pay for your physio. GO SEE A SPECIALIST!!