I think it might be too wet? This happened before with my orange tree and the wetness eventually killed it, so I'm nervous. If things don't get better soon, I'll re-pot with dry soil and make sure to put stones and sand in the bottom 1/3 or more to make for better drainage. The soil is damp at only about 2 inches down and the top leaves are soft and wilted, but, paradoxically, the bottom leaves are curled (not as much) and sort of brittle. I'm going to water the tree this afternoon, and if the tree doesn't show some improvement in 24 hours, it's re-potting time, but with dry soil and sand. Don't die, little tree!

