Dude,your not the 1st guy who's had shit fall & mess their game plan up,ive had all kinds of shit happen but........................
Here's the deal,so much shit goes wrong by accident in a properly set up room with every possible precaution taken to gaurd against mishaps, can you really afford to keep fukin around with that light?,living in a townhouse is understandable but damm,were only talking about 1 hole here not a remodel job, & you dont even need tools.
All you need to do is go to the hardware & buy a clothes line hook with a self tapping (pointed) end,then buy 10 ft length of chain & a couple of S hooks,mark the spot on the ceiling for the hook then take a hammer & nail & lightly drive the nail in to start a hole,pull out the nail & screw in the hook till it bottoms out,no more light collapsing after that.
If/when you move you can patch the hole with toothpaste then rub a little paint over it.