Ouch. That's really terrible. I came sooo close to having a similar fall today. I almost always unclip with the left. I made the conscious choice to "go right" for a change... I unclipped, stepped down, and then my exhausted body (after 20 miles in the heat) decided to lean left. I almost didn't get my foot out. I let out a little shriek just before it finally snapped out. I just pretended no one noticed.

Feel better soon!