Side and Back Pain when I eat
No, that's not weird at all. And for the feeling full, there is a chance that you might never feel that again. I still don't, but if I take one bite too many, I have the abdominal pain you are talking about, and it's not a happy feeling. I think you hit the nail on the head when you said 'too quickly'...slow down, and you should be fine.
Your stomach is on your side, although your pouch is not as far over now as your stomach was. If you look up an anatomical graphic, you can see that your stomach is actually in the left upper quadrant of your body, opposite your liver on the right. Now that most of your stomach isn't connected to the esophagus anymore, the pouch is closer to the center of your chest, but still over to the left somewhat.
Surgery: RNY on 12/18/2013 with Jay M. Snow, MD "Don't mistake my kindness for weakness." - Robert Herjavec, quoting Al Capone