Yeah, you sound very similar to how I was. Oddly though, I get relief when lying down ( think it maybe because the pain is so tiring!!).
Glad to hear you're having the Nissen I had mine nearly 4 months ago and the relief was amazing. The recovery is really not as bad as people make it sound either.
Unfortunately my post op barium swallow showed that the wrap has slipped but not sure I believe them
I find out properly next week!!
How long have you been suffering?