Be careful not to get yourself into such a stressed and anxious mode that you make things worse. Are you on PPIs now? If not, you should talk to your doc about starting them up for a while.
Also, be very careful what you eat. You may have irritated things by introducing some trigger food back into your diet. Remember with LPR it doesn't take much to get things going. Is the head of your bed elevated? If not, give that a try again.
Try to do all the things you did before surgery to help things along. I know they didn't help much then, but you've got the benefit of the wrap now, and although it's not doing the total job, if you help it along, it may do the trick, and things could improve again.
My asthma doc was concerned that perhaps my wrap had failed. I have severe allergies that affect my lungs. He sent me to an ENT who scoped my vocal chords (I'm continually hoarse--another thing pointin to LPR symptoms) and he did not find anything conclusive. He was inclined to say it was caused by coughing, (I cough a lot) but said just in case, he'd refer me to the surgeon who "does all the Nissens" in the area.
He did testing from A-Z and found everything to be normal. I've had a barium swallow twice since my surgery and both times it came back NO REFLUX. One of them showed some barium held up at the wrap site, but no reflux. In my opinion barium swallows are only useful in diagnosing huge amounts of reflux. Those of us with very little reflux causing big problems don't get much information. Who knows?
Wish I could be more help.
Good luck in finding answers. Until then, do whatever you can to reduce your reflux by watching your diet, etc.