Well, I'm post day 9 and my advice is to just keep trying. The first (4) days post surgery I had to stay in the hospital as I couldn't get down an ounce - so they would not let me go home due to obvious dehydration concerns. But after day 4, things started to become better and I kept after it with short/obtainable goals.
Now I am up to 90-100 oz / day with 120-150 grams of protein/day. So I know how discouraging it is in the beginning, but believe me, the persistance will pay off and you will soon be up to where you should be.