ppfuf

I would have sworn I posted a comment to someone's journal this afternoon, but this evening I can't find it. Can you delete comments in your own journal? On a related topic, can you search for your own comments made in journals of others? I checked the friends posts above and below the post I thought I responded to, but no joy.  
Of course, it's entirely possible in the aggravation of work today I wrote a draft and failed to click the "post this" button. Or perhaps I've finally gone completely out of my mind, ha-ha-ho-ho-hee-hee-ha-ha.