The sims 3 problems on a mac?

This is really annoying me. I can hardly play my sims 3 game anymore without it crashing every 5-10 minutes. This is what happens:

1) I'm in either create a sim or edit a sim's outfits and the sim/pet turns completely black then freezes then quits and a message pops up saying "the sims 3 unexpectedley quit" with the option to cancel, report, or reopen.

2) I try and save the game and it won't save because "error code 12" pops up

3) The game freezes while in gameplay and asks me if I want to debug my game with an option of either yes or no. No matter what I click, the game crashes.

This makes it nearly impossible to play my game and I have no idea what to do. I removed ALL of my downloaded custom content from the Sims 3 Exchange, and then uninstalled ALL of my expansion packs and the main game and then reinstalled them and it still does this. I'm not playing on a laptop so memory space should not be an issue. Do you have ANY solutions for this? I've spent all this money on the game and expansion packs and now I can't even play it.