I was given an amaryllis bulb in early December. It came in a box with a large peat pellet, a pot, and the bulb. I planted it, and it started to grow. It's got one flower stalk, and some leaves, but recently the leaves have flopped over and are turning yellow at the base. I think it's normal for the leaves to die back after blooming, but the flower hasn't even opened yet. I've never grown one before, and don't want it to die before I even get one flower. See the attached picture for what it looks like. Any advice?