Before I had my Nissen (long before) my PCP doctor had me on Reglan to speed up stomach emptying. Some people have big concerns about the side effects, but I took it for at least several years with no untoward affects.
The way I think it would work is this--
If your stomach is staying full for a long time and the emptying time is slowed, the Reglan will help move things along. If your stomach empties more quickly it should feel more comfortable.
My GI doc wasn't a fan of Reglan because of the possible side effects, but as I said, it didn't bother me.
Hope it helps!