I currently have about 50 full med apps and I'm using 8 mb of storage, and to be quite honest, I should have set it to only 4 mb instead when I first started installing all of these.

There's a nifty little trick that can be done to get this.

Anyway, as for Epocrates, I'm not quite sure what you're doing on your end.

This is how I installed it back in the day and I believe it should still work.
http://talk.maemo.org/showpost.php?p=271057&postcount=2

Cheers.