It's natural to be worried. I believe everyone gets worried when going through something like surgery. If you are like me, you probably googled "nissen fundoplication success....failures...diets....recovery...etc" I remember watching videos on youtube to see how the surgeon would actually do it lol. But don't worry too much. I remember a member Tony on this forum reminded me of why I decided to go with surgery in the first place.....that eased my mind. I realized of the state I was in previously and wanted to make a change for the better. If you have been tested for GERD/LPR, have a trusted good surgeon, there is good change the outcome will be good if you a good candidate. A surgeon will not perform this on someone who they will not benefit from it.
Since it's being done Laproscopic, most likely you will have 5 small incisions which will heal quickly in the beginning week. Pain pills will help and soon you may not even need them after several days to weeks. The liquid diet is challenging but as long as you are not tempted I feel you should be fine. Try getting liquid foods that you enjoy and it will be easy. For example, I love grape jello, creamy soups, and the flavor of boost....and that's what I've been surviving on without no trouble for the past 5 days.
For me, the pain post op was way less then the pain I experienced with GERD/LPR. There was episodes that were so bad I ended up in the ER. Since surgery, that pain has been obliterated traded with surgical pain that gets better day by day. Just be positive, time will go by, next thing you know it will be surgery day, you'll wake up and begin the process that myself and many others have been going through. Good luck.