I would suggest you wait and discuss this with your doctor and the anesthesiologist. They will work with you to figure out the best way to proceed. Remember, you will be in a hospital, so if there are problems, they can be dealt with immediately.

If your breathing gets weak, you may need a bipap for a few hours or during the night while in the hospital. But above all else, you mustn't try and "tough it out" because that will ultimately be harder on your body and slow your recovery.

Good Luck!