Replying to your questuon about a hiatal hernia causing all of your problems I would say most likely. I have a hiatal hernia and have also had the Nissen fundoplication done. Mine has held up well up until the last year and now I am back to having significant issues. I was just diagnosed with Barretts and I'm not convinced that the Nissen wrap slid or is failing. It is causing breathing problems that they say are separate from my asthma. Anyway, my suggestion is to find a surgeon who has high success rate with working on fixing hernias. God bless.