Don't worry about
the surgery...you have a very experienced and accomplished surgeon, so you're in good hands. I was released the next day (noontime) after my Nissen surgery, and it wasn't a problem. The sooner you get out of the hospital, the better. Get away from all those infections, and well-meaning but way too busy nurses. I'm sure it's a good idea to stay in the general vicinity to be available if you have any little glitches.
Yes, Day 4 is a challenging one for many people--some little annoyances can start (that was when I got some thick saliva being produced, which was annoying, but nothing serious). I'm with Ann and Kitt...you'll do just fine, and we'll be here to cheer you on and welcome you as you become one of "The Wrapped"!
The Nissen diet isn't all that bad, either. In my case it was liquids in the hospital, soft food for 5 days, then whatever could be chewed to a liquid (which is many things) thereafter.
You'll do just fine, Joy!
We're here for you.