My daughter was also born at 33 weeks and weighed 5 pounds 9 ounces, although she didnt get fluid in her lungs. The NICU explained it to me this way your baby is sick and needs a lot of rest. When your baby is born this early they sleep alot so they continue to grow outside the womb. My daughter had to come home on a heart monitor for about a month. When my daughter got to her due date she was a new baby she was awake more. simple things like just trying to breast feed exhaust them up to the due date. You have a rough 7 weeks but things should get better for you. My daughter is a perfect, smart active two year old now. good luck with everything.
Phillydad, prayers for a very healthy baby. ;D What you're going through right now is so very hard.
I don't think any of us on this board are going to be able to give you as much information as the doctors and nurses that are caring for your son. This is all so variable.
Can you find a doctor, or a nurse, who is very honest and open and who is willing to communicate with you? Sometimes they try to sugar coat things, or are unwilling to communicate anything, but lots of docs and nurses are very clear and honest. Find one of those, and ask these questions.
Very best wishes.