I might be able to help on the diving question. I'm a retired Navy Deep-sea diver and former instructor at the Navy Diving Salvage Training Center. I was banded on Tuesday (Aug 5th). The assumption is that you have gotten past the healing process and you are respecting your physical limitations.
The stomach and esophagus are gas filled spaces that are equalized with ambient pressure via the regulator on your tank. If you breath normally there should be no expansion or contraction of the stomach or esophagus. Now, on the other hand, if you were to go to a depth and take a breath, then ascend without exhaling, your stomach would expand and there would be a risk to the lap band. In that case though, the greater risk would be in an arterial gas embolism.:thumbup:
This also applies to flying.
So yes, you can dive without fear of damaging your band or health.
Best,
David