Do Plumbers Plumb?

This is my shower. It's a good shower. The pressure gets the dirt off without bruising your skin and it makes me want to do a collage every time I get in it. 

Recently we have had some smelly brown mystery liquid dripping from the ceiling of the shower. It is impossible to get clean in a shower when dirtiness is dripping on your freshly shampooed hair. After a few phone calls and some unspoken threats of withholding rent, the plumber came this morning. 

Now my shower has no ceiling and the whole apartment smells like ancient damp wood and plaster dust. The plumber can not replace the ceiling and that guy is on vacation until next week. He said it's ok to shower in, but I don't know. I'm scared of what might crawl out of there.