Hello, Borislav.
The growling sounds you hear after eating is from food and air moving through your stomach and intestines. As soon as you eat, your intestines activate and move "old" food through to make room for new food. Ever notice how drinking morning coffee or eating breakfast makes you want to go to the bathroom? So air, food, gas make noises. I always hear noise after I've eaten, like whooshing sounds as my guts move and push food along. The itch you are experiencing at night probably comes from leakage because your muscles are more relaxed when you are asleep. You are very early days after your reversal, so be patient, eat and drink properly, and try not to worry. Intestines don't like worry or stress. They shut down, or they speed up!