Grocery Shopping Fail

Yesterday afternoon I had planned to go grocery shopping after work.  I checked Constance as I grabbed my buggy, and she said I was 74 mg/dL but going steady.  Anxious at the thought of going low while shopping, I grabbed a soda from one of those refrigerators at the front and sipped on it while I got my things. 

Feeling confident that I was preventing myself from a low, I gave no thought to how I felt.  I didn't even feel the need to look at Constance the rest of the time while I got my things.  I continued sipping on the soda between retrieving the items on my long list.  Salmon, diced tomatoes, razors, cat food, and things of that nature. 

It wasn't until I got back in my car and put my soda in the cup holder when I took thought to how I was feeling.  "Huh, I don't feel low, but I don't feel much higher, either."  I glanced at Constance and saw I was still 72 mg/dL and going steady.  "What?!  How is that possible?!  Am I cured?!"  That's when I looked down at my soda and saw the magical word "Diet" on the label.  "Blast!"  (I actually said that, in my car, out loud.)  I had grabbed a diet soda, by mistake!  Kind of ironic for a diabetic to say, no? 

But what really threw me for a loop is the fact that I spent an hour walking around a grocery store, picking up things, pushing a cart, loading my car, etc.   All these actions SHOULD have made me go low.  In fact, the anxiety of going low is usually enough to make me go low!  But I was in the state of mind of "Oh, I'm sipping on regular soda, I should be fine" and kept on with my normal activity.  If I could harness my anxiety of going low, I would be able to save myself from A LOT of lows (and money spent on fast-acting carbs)! 

Has this happened to anyone else?  Please tell me, because I felt so embarrassed.  A weird diabetes failure.  This isn't the first time I've grabbed the "wrong" kind of soda but reversed, like grabbing a regular instead of a diet.  Maybe I should just stick to my glucose tabs.  At least they don't make those in diet.