I'm 3 weeks post op. Last week while eating I got severe pain in my chest, felt like I'd been stabbed in the chest. Lasted all night, I felt the pain slighter for 3 days... Although the pain is gone now, I'm curious to know what it might have been. I never want to feel it again. Almost like swallowing an ice cube that won't go down but much much worse!

There's no way to say for sure what it was. However, your description of feeling that an ice cube stuck in your esophagus (am I reading you correctly?) suggests that your food, in fact, got stuck in your esophagus. You may have taken too large a bite (or spoonful, if you're still on purees or soft food) and/or not chewed thoroughly enough and/or not paused between bites.