Sorry for the late reply, was out of town on vacation!
Let's Get Ready to Fumble: This is totally awesome for a silly campaign! Only thing I'd want to suggest is if the victim is immune to the result, he should reroll until he gets one he is affected by (losing/breaking the weapon when he's using natural attacks, immune to mind-affecting and gets confused or a morale penalty, etc)
Acid Flashbacks: I'd allow him a save to negate each instance of flashbacks. Which would still be very nasty, considering if he gets attacked and damaged once in a round, that's 2 saves he'd have to make...
Demonic Bowel Movement: Don't even wanna picture fiendish butt monkeys...
Greater Addiction: I'm not well versed in addiction rules, so I'll have to pass on rating this one.
HULK SMASH!: Add in the save to negate getting pissed off, like Acid Flashbacks, and you're good.
Insect Mind: Considering this probably isn't much worse than Baleful Polymorph, you could probably lower it to 5th level.