I had this exact pain yesterday and was woken up by it a week or so ago. Yesterday, I thought I was dying it was so bad. I phoned my fill doctor and he said to come right in. Of course by the time I got there the pain was completely gone, but he said it sounded like gallbladder so is sending me for an ultrasound. The only way I could describe it was it was like really bad indigestion right below the sternum, but I couldn't get relief with tums. Anyway, he said it wasn't my band and proceeded to give me a 1.5cc fill (my first, I am only 5 weeks out). So, if he's not worried then I'm not worried - I think it's the not knowing that is so scarry. Hope it doesn't happen again - to you or me!