One thing I see from most of your posts is your quest to hurry up and recover. If you have read any of the posts here you should remember that the recovery for this surgery is a long one and you would do well to try your best to relax into the recovery and flow with it not against it. You cannot rush the recovery after this surgery. You have had Major adjustments to the inside of your body. Your intestines, liver esophagus, stomach and I don't know what else has been pushed, moved, lifted, pulled and sewn. You are not going to recover from this in a month or 2 or even 6. The biggest part of your healing will take 6 months, then it will continue up to and through 1 year. You will probably always have to thoroughly chew your food (as should be done anyway, but most people do not do it).
Please do not be impatient, you will be surprised how quickly time passes and recovery comes about
if you are patient.
I believe Denise had a great thought.. you should check out an insufficiency as she noted. If you are not sure of he diagnosis or lack of, that the ENT gave you, by all means you should pursue another avenue and physician. This may be something that has nothing to do with the Nissen, just happened right after the procedure.
Please try to relax and don't rush your recovery.. take it easy and enjoy the fact that you may see improvement in a much shorter time than it took to get to where you were before the surgery.
Reach for the Sunshine... Rainbows will follow...