Have you tried resetSim * - it will reset all sims. Just open the cheat console - type in resetSim * - and hit enter. Don't worry if the game pauses for a few seconds - it's normal.
Also, testingcheatsenabled true might help get rid of the paparazzi. Have you tried that?
To get an earlier save, you will have had to have used "save as". In that case, you can go to your saves folder and load the file. Let's say a save from a few days ago was named "Sunset Valley" - then this save currently is "Sunset Valley 1" - when you go to the saves folder, your Sunset Valley will be there looking like: Sunset Valley.sims3.backup - simply rename it to: Sunset Valley.sims3 - then you can play that save again.
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