Pain when eating and drinking

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I was banded in June 2015 (exactly 2 years today actually) about 3 days ago I started feeling pain while I was eating, I got a very sharp pain in my back and just thought maybe I had eaten too quickly as I had to go and regurge it back up, but it also felt like I had pain while food was passing through my band but it's happening when I drink as well? It's a very strange feeling like the band is moving? I've never felt nothing like it before, I'm just a bit worried that the band has slipped, has anyone ever had anything like this before?

Even though I'm getting the pain while eating and drinking everything is still passing through as normal it just feels really strange, not the norm that I'm used to.

if anyone has any advice on what to do it would be much appreciated!