My guess is that your stomach is reacting to a succession of assaults within the same year. It generally takes a full year for one Nissen to heal completely. I would think that your stomach has reasons to be angry, having had three tussles with the surgeon within the course of a year.
Be sure to write down what you've experienced...starting with your first surgery, then each successive one. If you're like me, you'll forget anything that isn't in writing. Sometimes (depending on the doc) it helps to type and bullet point your comments, leaving space between each entry to make it easy to read. Then just hand it over to the doc and let him read through and comment as he goes. As I said, some docs like this, some don't. If you try that, make sure to keep it very to-the-point and not very wordy.
In any case, you can hang onto your list and it will remind you what to say.
Good luck with your appointment! I'll look forward to hearing what the surgeon you see has to say. I hope your eating issues improve very soon. Hopefully the doc you see will have some ideas as to how to improve things short term.