BRNEYEDGIRL!! I couldn't believe it when I read your post. I was just getting ready to write one that was almost word for word the same as yours. There were a couple of differences...For 1) I didn't have my kids w/me. 2) The grocery store was very crowded.
I started feeling exactly like you described physically and it just kept getting worse. I just KNEW I was gonna die. I was looking for pancake mix at the time and couldn't see it. I started Screaming that there was no pancake mix. I finally sat down on the floor, shaking. People were just staring at me. Finally, a very sweet elderly man walked up & handed me a box of pancake mix. He said, "I don't know if this is your brand, but it has a nice box" I could have kissed him
I have never seen him again at the store. If I ever do, I am going to give him a big hug

and a
tulips