I don't think that's it Nai, it's actually well up behind my ankle, not in my heel. Thanks though!

Well, whatever it is, it's almost gone, yay! I can almost walk normally today, and although it's still tender and swollen, it's not nearly as sore. I don't care what it is, as long as it doesn't come back! Very hard to run after a toddler when you can't run