Of course you should call the doc if you're having so many problems. I would say at this point, probably your GI would be a good option, but the surgeon could also answer your questions.
I can say this...intermittently I have a similar issue. It comes and goes, depending on how my stomach is doing. If it gets irritated by something I've eaten, I'm getting all the gurgling and noise, and am dumping. Keep in mind that your wrap was created by pulling, stretching, and wrapping some of your stomach around your esophagus and stitching it there. Your stomach is not a happy camper. It'll take some time for it to get more comfortable.
I have a highly reactive stomach, and I'm sure that's why it happens for me (I'm one year 9 mo. post op). The gurgles and liquid, pudding, squigglies (in that order) stay around a day to maybe three or four days, and then I'm back to normal until I eat something that irritates.
It is normal, but not everyone has it. It will subside as your stomach heals.
I usually don't have to run to the bathroom all day...I just let loose in the morning (requiring toilet clean up because of the gas that creates a mess--TMI? Probably) I can always tell when it is going to happen because I can hear everything gurgling out of my stomach right after I eat.
So...in the extreme, dumping can be a real problem. If it's intermittent, it is just one more inconvenience, and this too will pass. My guess is that it's a result of the fact that your upper GI is still complaining about your procedure.
I've never bothered with Imodium. My son has irritable bowel when he's nervous, and never goes anywhere without it. I find that I'm fine...can go places, do things. The noise is embarrassing, but most people assume I'm just VERY hungry!
Sorry to hear you're stuggling, but "this too shall pass" so to speak!