I'm not sure about back pain but I had the same feeling of food stuck in my chest/ throat. For me it was a stricture and I had to have procedure to fix it. Now I get that sensation when I have ate too fast. I'm not sure which is the issue for you but if your chewing really good and taking small bites at a time and still having that situation,,,,let the doc know. It could mean a stricture and for me the stricture got worse. On week 3 after the surgery when I was supposed to be able to add purée foods...I could not because it felt stuck in my chest and eventually I would have to force myself to throw up to get rid of the food stuck there because it would be painful. Then the stricture got worse and I couldn't even swallow liquids. so be proactive about it and bug your doc if it's not getting better,