Loud stomach noises
If you are taking chewable bariatric vitamins, check the label for sorbitol or maltitol. Both are sugar alcohols that will cause digestive issues, including loud stomach noises. Other sweeteners that end in "tol" will do the same. Sugar free gums and mints can do that too. Also you may be starting some lactose intolerance so see if milk is an issue.
Elimination of one thing at a time can help you find out what is causing this, but as Gwen pointed out there may be nothing that you can do and just have to live with it.
Real life begins where your comfort zone ends
I also had my surgery in December and have a very noisy tummy. I arrange my eating schedule to avoid embarrassment whenever possible.
VSG Surgery 12/15/14 HW 247, SW 212, CW 163