I also had the Nissen surgery because of GERD's effect on my asthma. It's DEFINITELY worth it, and in your case (and mine) there is no choice. It's a life-threatening condition when you have asthma that can't be controlled. I wish I'd had it after only one bad asthma season. I ended up waiting for four horrible years of uncontrolled asthma, because I was frightened of the surgery. Because of that, I had damage done by the high steroid intake I required to keep breathing. I also have allergic asthma, so it isn't completely gone, but far, far better than it was.
Bill mentioned that every surgeon is different regarding the diet they recommend. Mine, like Bill's, only had me on liquids for one day, and soft foods until I saw him on Day 5. At that point he told me I could eat anything that could be chewed to a liquid.
I had gathered all kinds of liquid foods prior to surgery, and only ate a few. I ended up throwing most of them out.
It's a good idea to check with your surgeon, so you know what to keep on hand.
When you say you're taking Carafate, is that the pill or the suspension form? If you're not taking the suspension, you should. That's what will really help you feel better. The pill just coats the stomach. The suspension coats your esophagus. If your insurance won't pay for the suspension form (which is by far the preferred mode), you could put the Carafate tablet into a little medicine cup and add some water, then stir it with a toothpick or something. Then take it like a "shot". At least it has a better chance of coating your esophagus, and not just your stomach.
Good luck with your surgery! Be sure to stick around this forum. There are lots of people who've been through just what you're going through! We're happy to support and encourage your through the surgery and recovery! Welcome!