The only way to find out is through endoscopy. It appears that some people just don't do well with Fundoplication. I am one of them. In January I had a routine endoscopy and they found the wrap not intact and a large hiatal hernia. I was on Rx Nexium 40mg which barely worked.
No there is no sphincter anymore. Each surgery for this is specific to each patient. My esophogus is just a tube that feeds a smaller stomach now.
It has been pretty hard to get used to eating like this. I am not obese...I have never been. My problem was simply reflux and gerds.
There are actually very few diets at Mayo for gaining weight. Which is quite disappointing. Liquid diet and blended diet was not so good for me and lost more weight. I am stabized right now at 127lbs Good luck to all. God is Good