LOL.... Not a silly question at all. Actually kind of funny.
The gas they pump into you inflates your stomach so they can do the surgery without opening you up completely. That allows for a quicker recovery, however the gas gets trapped in your body and it sucks (at least it did for me when I got my gallbladder removed). My shoulders would ache when I was upright so I would lay down and then have to get up (cause I had to keep walking) and then lay down again. Like I said, it sucked but it only took a day or so for my body to absorb it. It was 10 years ago but I still remember being mind-boggled because I just had my gallbladder removed and expected pain from that and my pain was in my shoulders. It wasn't severe, just irritating.
So anyway, your body absorbs it (eventually). I have heard though the more you move around the quicker it goes away.
Now that I think about it, I'm glad I experienced it back then so I know what to expect for that part anyway.