Have you ever tried foam rolling OS? I had a similar injury just lower down the leg on the inside, it just wouldn't heal up so someone suggested foam rolling. It was painful as hell rolling at first but with each session the pain subsided and within a couple weeks i was all healed up.
Here's a short vid. on foam rolling. At the 2:00 min. mark he touches on groin rolling, you just have to play around with it a bit to make it work for you..:
Top 5 Foam Roller Exercises - YouTube
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