It's the middle one. I woke up with it on Sunday morning, after a fairly raucous party so it's possible it was stomped on but I don't remember if it was!
It really hurts when I walk on it but there's no visible swelling, bruising or redness. It doesn't hurt to press/squeeze or wiggle it, only when I put weight on it and whilst I've suffered worse pain in my life it is bad enough to have me reaching for the Neurophen and I'm not generally one for taking tablets.
I thought it would be better in a couple of days (whatever it is) but it's getting worse.