Carol - Amaryllis bulbs are dormant PRIOR to their blooming. From now until next fall they should be producing lost of healthy leaves that will photosynthesize and rebuild the bulb.
Jane - An occasional lower yellow leaf is not a cause for concern. If you are getting more than that, then it is either not getting a lot of direct indoor sun or the soil may be staying too moist. Did you repot recently? Can you post a photo of the entire plant, including its pot?
