It could be diabetes...but there's only one way to know for sure what it really is. Go to a doctor.

I've been checked for diabetes already and I know it's not that. They ruled out all other possibilities, which left compartment syndrome. But I have such a light case of it that they didn't even bother doing the test. And it rarely comes back anymore unless I do hard long runs. How's it feeling lately? Still going numb on you? Or has it gotten less frequent as you've continued to workout?