Panicked at the grocery store!

I keep forgetting to mention this in my blogs.  I don't know what the heck is going on lately but whenever I go grocery shopping I get all panicked and nervous.  I'm embarrassed to be there.  I'm humiliated that people can see me buying food, even if it's healthy food.  I've never experienced this ever before.  I won't look people in the eye, I find myself darting down isles with the fewest people to avoid being seen.  What the heck?!  I haven't told anyone about this yet.  Have you ever experienced such a thing?