Wow I am glad to hear you feel exactly like I do. I am 5 weeks after my laparotomy to have bilateral 7 cm cysts removed due to endemetriosis and I don't fit into any of my clothes either ! I have been told this is called muffin top or swelly belly but I am getting frustrated. I posted the same question as you and got different responses, I think the gas will go away soon enough but the swelling can last for several months I think and get worst when you over exert yourself, I have also gained 5 pounds but I don't know if it is because I am not as active as I usually am but I definetely don't fit into my pants either. Lets hope we get some answers, I have been walking everyday but although better than right after surgery, my body is no where near what is what before.
Mine lasted about 9 weeks but I think I'm a worst case scenario for that.
It seems that low impact movements, like walking, are the best remedy. Rubbing/massaging the abdomen (gently) in a circular motion seems to move the gas as well. The gas is trapped in the abdominal cavity so I don't think medications with simethicone do much good (that stays within the digestive system, but the gas is not really there).
Gas was my WORST side effect of the surgery. I was more tolerent of the pain from the healing of the incision, etc., than I was of the gas pain.
Move about gently and it will bring some relief.