Oh boy, I'm sorry to hear your plant is not doing well. Sphagnum moss in a glass container with no drainage is not a good thing. As Kevin has said, probably root rot due to too much moisture. Orchids like ventilation and good drainage. Sphagnum moss retains a lot of moisture. Many here in geekland don't like moss because we overwater. Others love it.
Follow Kevin's advice. He knows......
