I go through this every year with mine, I set them outside for the summer, for they seem to get spetacular growth that way, but when I bring them in they go through a shock of sorts, just like you are describing. What I have been told you are suppose to do when bringing them inside is to do it slowly, like bring them in at night and set them back outside during the day, then just leave them out for half a day, then leaving them inside, it is suppose to keep them from going into shock as much, I don't do that as that would take forever! I usually spend a week getting all mine moved back in as it is:) My friend fertilizes hers all the time and I noticed she had a lot of yellow leaves on hers, I told her to stop doing that and they look a lot better now:)

STOP all ferterlizing until the plant is growing in earnest. It wont grow much at this time of season, the sun is very low ---the winter solstace, the shortest day of the year is approaching....and after that takes its time to resume what plants prefer. Wait until mid February/March to resume feeding. NEVER feed a sick plant, that only exasperates the problem. Put your plnats into good light...even direct sun but be careful about how the sun comes through the window glass...it can burn even in winter. Don't allow it to touch the window glass...its too cold and the leaves will feel it. WAter to drainage, dump the excess after 5 - 10 minutes...allow the plants to dry down somewhat...but rely on how the plant prefers its soil...dry somewhat or damp. Allow the water to sit overnight to gain room temperature and allows somewhat some of the fluorine to dissipate out of the water. Dracaena especially does not like fluorinated water. For this plant you are directed to use another source than out of your taps. Bottled water, or melt some snow, is preferred and let it gain room tempeature. The reason for this is tap water has a certain amount of salts in it. Dracaena reacts to such salts very quickly. So over time, as you water it, the plant is taking up such salts and soon will show its effects. Fertilizer you gve the dracaena should not have the ingredient "superphosphate" in it. Like the tap water, the plant reacts to such phosphurus source. Generally, plants suffer from overwatering more than all other causes combined. So let your plant dry down between waterings and always, water to drainage, dumping the excess after 10 minutes. STOP all fertilizing until the plant resumes its health. Never think to give it a pinch. Give it nothing but good care and warm sunshine....and STARVE IT.

That looks like scale. I have a lot of the exact plant and had to remove some leaves because I asked same question and that's what I was told

Otherwise known as Devils Ivy...Right? If so, what do you use for a trellis? Did you buy something, make something? Mine isn't all that big, but I don't want it hanging over the pot (I have cats). Right now I'm using a marshmallow metal roaster thing...and a small Bamboo curved trellis.