Is there a way to find one’s own MUO questions other than trying to recall the exact wording and searching the upper left test box?
The easiest solution would be to create a Disqus account for commenting. That would create an account for you along with all your comments. Of course this would require that you have left at least one comment on each of your questions. :-)
Why not just create functionality so when clicking on a users name it would list all their MUO Questions? it would be a simple query that would search for their email and return the results.