I'm glad I popped in here. I was going to mention to be very careful, whatever you do. I had the same thing happen to me, which I traced back to doing strides while I was having other issues (probably stemming from a hamstring problem) which caused me, purposely, to change my stride in order to complete a set. Stupid, but it was going on two years since I could even do strides, which are essential, in my opinion, to good running. So, I was desperate.
Anyway, that's how it started. The pain was very, very minor at first, and very gradually got worse, until it was quite painful, and sneezing would darn near put me in tears if I didn't get in a bent over position. But, I continued to run for months, thinking it would eventually go away.
Finally, it got the best of me mentally. I just got tired of being in pain all the time and decided to stop running, for good if need be. Well, fast-forward two months and I'm starting back up, and feeling fairly good. Still not sure if that is going to continue, though. I ran 60k last week, and will probably end with that much this week as well.
All that, just to say, be careful, and honest. I wish I would have gotten things under control earlier. I missed my marathon because of it (did get some unrelated things checked off my "rainy day" list though).