You're 3 weeks post-op, and you're spending way too much time worrying. Everyone has difficulties and quirks at this stage in the game. In my experience, you would be hard-pressed to find a GI doc to recommend, or surgeon to do a Nissen unless it were, in their opinion, extremely necessary.
The symptoms that sent you to surgery and all the prerequisite tests were a long-term problem, and you're not going to get rid of them in three weeks. In addition, you're experiencing other symptoms as a result of normal post-op recovery.
This surgery takes a full 6 months for most of the healing and a full year for the rest. You're at week 3. Yes, indeed, you can be getting very uncomfortable and even reflux-like symptoms from food, drink, and medication that are held up by the wrap site. The pain behind your breast bone is pretty much right where the wrap is located.
Remember that although you only have 5 little slits, you've had MAJOR, MAJOR surgery inside. It's extremely common to have pains and continued "reflux" symptoms. Remember that your surgeon told you that the esophagus is a "dumb organ", and that dumb organ has been through a huge trauma. It will take time for it to heal and adjust to the major changes that have been made in your upper GI tract.
So what to do? You've done all you can at this point. You've seen your surgeon and an ENT. Now all you can do is wait. You can't rush this, you can only surrender to it and follow the path it takes. Worry and second-guessing your decision are counter-productive and will not do a thing to improve your situation.
It took me 6 years and two GI docs to convince one of them to refer me to a surgeon, because he didn't think my reflux was bad enough and was certain it wasn't causing my lung problems. GI docs and surgeons don't like to do this surgery unless they think a patient is a great candidate. I rather doubt you would have found ultimate relief without the wrap.
So try to relax and surrender to your recovery. Don't stop asking questions. If you're worried about something, or want some advice and support, keep posting. I'm not trying to dissuade you from doing that. It's just that I think you're driving yourself crazy with worrying and second guessing yourself, and I'm trying to calm you down! Believe me, I've been there, done that! We all have.
Have a great night!