Is this possible? That is, posts that I've commented on in the past.
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In the old past, not that I'm aware of (without using the data dump). However, in the recent past, your profile page has an "Activity" tab, which shows comments, edits, questions and answers.
Just for that, I added my "user feed" to a reader (Apple Mail, for me) that keeps history forever (rather than just the recent things as shown on the "Activity" tab). It even stores things that are deleted at some later time.
(You know, the RSS icon on the bottom of your own profile page. Or anyones profile page for that matter.)