We have a dracaena that we replanted. It is 6 feet tall and was root bound so we replanted it and trimmed it's top off. Now after a month it is droopy and the leaves are yellowing and falling off. We are in N. California and plant is inside in same location it has sat in for 20 years, so I'm not sure what's going on. We used miracle grow planter soil with plant food in it already. I need to save the plant. Any advice???