I posted a question before Christmas on 12/24 and had the Notify box checked with my email address provided. I did not have a registered account when I was posting my question but I did pick a tag "nhibernate".
By clicking your name on top of the screen, your profile will show your activity (currently none for the account you used to ask this very question; please ask "team" from "@stackoverflow.com" to merge your old account and duplicate account, and also please associate your Stack Overflow and Meta accounts at the account tab of your profile). And clicking the little mail envelope next to your name even gives you some more details. If you set up an RSS reader for your own profile, then you can have that reader keep as much history as you want. And using
in the search will limit all search to your own contributions.
It looks like your post has been found, but to make things even simpler I've merged your user accounts - so now you can click on your profile to find it. Of course, to avoid losing it again you might want to create a registered account. It is free and won't require anything extra (you already have an OpenID via your e-mail provider).