You made me giggle. You see, I always try to keep a running tally in my head and always round up. That can be a good thing, especially since I am the kind of shopper that will go put items back that are not necessary. In my mind, they were mine for the time they were in my cart.
Now, for the roller coaster ride you experienced, I suggest a nice cup of coffee, tea, sweet tea and a chocolate bar. Works like a charm for me.
Many blessings to you.
Blondie