I'm so sorry to hear you are having such problems! I'm assuming you had tests to determine what was happening. Which tests did you have?
A general surgeon can be fine if that surgeon has a tremendous amount of experience doing the Nissen surgery. If you have a younger, less experienced surgeon, or one who thinks he's up to the job, but hasn't had enough Nissens under his belt, you can have problems.
My surgery (2+ years ago) was also done by a general surgeon. I was living in a smaller city, so his experience with 300+ Nissens and high recommendations from multiple sources gave me the confidence to go forward with him.
I'd learned here of the importance of finding a highly experienced surgeon for this particular surgery.
In my new, larger city, a thoracic surgeon would be my choice. There is one here who (according to most) "does all the Nissens" (1000+ surgeries). That would be your best bet. Never accept a surgeon who doesn't run all the necessary tests (endoscopy, manometry, barium swallow, and PH monitor--also a stomach emptying test ensures that your problem is GERD rather than gastroparesis.)
I agree with Joy that you need to be even more careful when selecting a surgeon to do your repair surgery. If you are close to a center like Cleveland Clinic, Mayo, or a large medical university (Duke, Johns Hopkins, Loyola, etc.) that would be the place to go for a redo workup and surgery.
Again, sorry you're having to even think about
all this. You know we're here for you! We'll help in any way we can, and offer lots of support and encouragement!
Take care, and good luck!