I'm so sorry you are feeling so bad. The problem with surgeries of today is that they are done quicker, less invasive and shorter Hospital stays. So, we go in have the surgery and are sent home. The fact is that you did have major surgery! You are 4 days post op, don't question why you feel like a truck ran over you. REST girlie! If I were you I would call and ask your surgeon about the gas issue, but pain and the other symptoms go along with a major trauma to your body! Having an organ removed is MAJOR TRAUMA!
I know when I had the Fusion surgery, my Hospital stay was 23 hours (its longer today). I'm sent home in a daze wondering why I feel so bad, when the surgery must have been minor if I only stayed 23 hours....go figure the mental anguish was as bad as the post op pain.
Give yourself a break and rest! I had my GB out in the 70's when they cut you down the middle with a gross drain.....It took 2 weeks before I felt human!
Hang in there....you are in my prayers!