I have no doubt that you are still healing. I've been on this forum for over two and a half years, and have read of many who had a lot of trouble with bloating in the first months, but it gradually subsided over time. When you get a lot of gas in your stomach and don't burp, does it enter your intestinal system and head out the back door? That is a very common thing...people tend to have an inordinate amount of gas as they heal.
Did you burp a lot before your surgery? If so, I'm sure it's very frustrating that you can't do it now. My stomach only burps itself. You're right that burps occur when I eat and not in between meals really. I have had bloating occasionally without being able to burp, but it hasn't been something that bothered me daily. Most of the time my stomach burped enough to avoid it.
I am pretty confident that as your healing continues the gurgling will subside and things will get working better. You are the only one who knows how you feel and how difficult it is to manage with your symptoms. If it's just too difficult to live with, then it makes sense to see if a dilation of your wrap will help. If you are comfortable enough to wait it out, you could see if things improve, and if not, get a dilation later. It'll really be your call.
Hopefully somebody will be by who can share their experience.
Hope you had a good trip home, and a fun visit with your sister!