are we more likely than others to get RSD?

I injured my thumb over the weekend and a small but deep chunk was bitten off by a hinge. It's small, like half an inch diameter, but conical,like an upside-down volcano. I went to an ER and was given a tetanus shot and antibiotics and told to just put bacitracin on it and I'll be fine. Nothing to stitch because it was too wide.

But just changing the dressing tonight--this is day 3--had me, literally, in tears, sobbing in pain. I'm not a crybaby, but it was as if my thumb was stabbed down to the bone. It looks clean and all, but the pain is way more than I'd expect. It was just excruciating. Now it's calmed down and is just throbbing.

Does this sound normal for this type of injury--kind of a deep small bite of skin? Or is this because of neuropathy, and am i at greater risk of RSD? I googled preventing RSD and came up with Vitamin C.

If anybody has any suggestions, or knows if there's more prevention, I'd like to hear.

It's really pretty small, but deep. I'm on 5 days of Keflex.