What does it feel like to get your food stuck?
I felt this way when I had too much sugar inadvertantly. Check the label on that smoothie. (I've found that some of the carb control products are high in sugar.) Could possibly be that a chunk of the apple got stuck, but I *think* we are all past that. The dumping episode I had was very intense, just like what you describe. Made a believer out of me, I'll tell you that!
Gano