About 3 weeks ago my indoor dragon plant (Dracaena marginata) was knocked off the cabinet it was on - about 2ft from the floor, it lost about 2in topsoil. It seemed to be OK for a while but recently has now been getting dead ends of leaves and curling brown sides of leaves and then there are leaves that are totally brown and fall off when I touch them - from the centre of the (bud?) of leaves rather than the outside.
The pot it's in is non-draining so I water it when it the top inch or so gets dry. However recently I've been watering it with sugar-ed water to try to encourage some aliveness in it. I love this tree and really don't want it to die. Is there ANYTHING I can do :(

You have been over watering. If the top is dry, doesn't mean the rest of the pot is dry and usually not the case. There is a water meter you can buy that tells you how wet the pot is. Don't water with sugared water.

Dracaena can go quite long without water. I have two healthy plants.

OK thanks! That's good to know