Ovrplay

Hello, Im am presently 4 days out from lap band surgery. I have horrible gas. I had to go back to the hospital the evening i was released because it was so unberrible and made my blood pressure go sky high. I spent the night and after the dr drained the gas and air off my lower stomach with a nasal tube i felt much better. I was allowed to come home yesterday and felt pretty good on the way home. Later in the day and evening the gas pains were back. How long does this last or will they ever go away. Im afraid to even sip on my water they are so bad. When does it stop or what can i do to help with it.