Barb, I'm sorry your surgery ahd to be canceled for the moment. But better to have it cancelled than be in ICU for months because of respiratory problems. Start those deep breathing exercises, remember abdominal breathing, opens up those lungs clear to the bottom.Hand on your tummy, Breath in through the nose to the count of 5, hold, let out by pursing your lips & blowing to the count of 7, hold & do again. If you do this several times a day 4 or 5 times each you'll really build up your lung capacity. You should feel your tummy move while doing this.