Hello AaronB! Welcome to PC! This is a wonderful site with wonderful people.
I can tell you this, you are NOT alone with this anxiety issue. I can relate to you when you say that you can't let something that happend a while back go. I do the exact same thing-I look at my past actions (anywhere from a few days, weeks, or even years ago!) and I constantly worry over them! I know how you feel, so don't worry, your not alone. I also know how it feels to keep it a secret. When I was in public school, I had to keep this problem to myself-sometimes I would space out and worry about something when I shouldn't be! (It was so hard to pay attention in class.) Anyway, I hope you are doing well! And I hoped this helped. 
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Dash out, dash out
From your far too sad destiny
You’re not the flower of hell
At such a place
Don’t bloom, don’t bloom
You mustn’t get caught
The pieces of time flutter about ...
-When The Higurashi Cry
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