Hate to say this but that close up looks like you could have some mealy bugs on that. They are very hard to get rid of once you have them and they will spread to other plants. You might want to consider dumping it for the sake of your other plants. I have been fighting a mealy bug issue for quite a long time now and even have been using a systemic spray and still haven't completely gotten rid of them.
Do you see white somewhat fuzzy small spots especially in the joints where the leaves connect?
