A lot of times stress can cause gastric issues. You're new to the band so your body might be adjusting a bit. You're doing a great job so far, sometimes we falter a bit but remaining diligent about your post surgery rules will help greatly. Good luck and hope you feel better soon :-)
What your insurance covers or not is totally dependent on what type of plan you have. Some plans pay for anything and everything some pay for nothing. Definitely check it out, a lot of doctors will also work on a discount for cash plans so you might be able to use some insurance and some cash but in the end your health is THE most important thing in life :-)
Good luck!!