Problem With My Band

I have had the band for 5 years. Wonderful thing and been down at 80#s off for 4 years. I have had ongoing problem for past year and half. I am fine all day long but at night when I am sleeping I am getting fluid back up in my throat, which wakes be up. About two years ago I had band checked and my pouch had became inlarged. I had the fluid removed from the band for 6 weeks to allow the pouch to go back to a normal level. I have been taking zan tac for over a year when I go to bed but last few weeks I have been woken up by a very bad pain in my chest. I am burping a lot when I wake up. If I sit up then the pain and fluid will go away. Anyone else ever experienced this problem?