Feeling full with just liquids

I have a hiatial hernia and GERD. I have been having a problem feeling full almost constantly. I can just drink a glass of water and feel full for hours. I had an endoscopy last week and he said there was some erosion. I don't actually talk with him until next week at my appointment. This has been going on for over a month and it is very difficult to eat when you already feel full. I have lost almost 5 pounds in a month. Does anyone else experience this and is there anything that will help. I am already on nexium. Thanks