Agree with the mealy bugs..start wiping them off as suggested by Ken.
As to watering during winter, lay off a bit with watering, they do not need that frequent watering, especially during winter. Once a month during winter is often more than enough. To be honest, I do not even give them fertilizers, and they thrive so well here, growing them outdoors, beside our house and they survive well, in our mild winter conditions. They do not really need a big container, very shallow root system. You may want to chop top portion a bit if it feels like getting too tall, and to encourage growth on the lower portion of the stem/branches, or just prop a stick to help it hold its weight. Then let the chopped off portion callus then you can stick it again in the same container or in a new container. Those stems can hold a lot of water so do not be too worried about it getting thirsty. The plant knows how to conserve its resources, oftentimes, I see this plant dropping older leaves, to give more to the new growth coming about.
I do not know where your location is, so depending how your winter goes, you may have to wait a bit in the chopping off part, I prefer to do any trimming when it is really warm.
