Lap band- anyone have these symptoms?

I have had a gastric Lap Band for 5 years now and I have been suffering very badly for the past 6 months with a very protruding upper abdomen after every meal and recently have been constipated every single day and even though I take laxatives my stomach is still abnormally bloated to the extent that I look pregnant. I was wondering if there anybody else who has this and is it related to the lap band or is it something more serious? If you do have what I have what to do you take exactly. I have taken a Gluten and Lactose blood test and I am not allergic?? Any help would be very much appreciated!! Thank you

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