Sounds like something is super inflamed. Ice or heat?
I hope it feels better quickly. At least bilateral issues are generally better than having just one side sore (in my experience, pain on one side = bad and pain on both sides = super super soreness or inflammation).
I really admire your bagging your long run - I think it takes more confidence and toughness to quit when you know it's a good idea than to just push through.

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maybe she's born with it, maybe it's chlorine
If you're injured and need some sympathy, PM me and I'm very happy to write back.
disclaimer: PhD not MD