Is there a word for when you realise that...

Miscellaneous and Personal Stuff I Must Share
1

…you’ve completely forgotten what that song you just couldn’t get out of your head sounded like, and now that you can’t remember how it goes, it’s annoying you even more than it did when you couldn’t get it out of your head?

And why does this happen? Surely I sure be glad that the damn thing’s out of my head…

2

Hm, that’s a pretty specific thing for there to be a word for. How about ‘Sodgett’

3

Hmm, Sodgett… Is that so-DJET or SOD-get? I like the first one better. Sounds like ‘sod it’, ha.

“Why are you staring into space like that?”
“Oh, don’t mind me, I’m just sodgetting.”