I totally agree with Bill's comments. At your early stage of recovery, you've got lots of healing to do, so it's way, way to soon to reach any panicked conclusions.
Healing takes lots of time. Six months for most of the healing, and a year for the rest. Your wrap will relax in time, and if it doesn't, then it is time to consider dilation.
It is most likely that you've got food/drink/even meds pooling at the wrap site. The fact that you haven't had discomfort swallowing doesn't mean that all the food is making it through the wrap.
Hang in there, and give your body time to heal. Try to have patience and trust in the process.
Hang in there!
Nissen Fundoplication 2/09
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”