I sometimes get Deja Vu. As for the freaking out, its normal when you smoke too much... chill out; you're young, take it easy.
man, thats nothin to trip about. you just need to chill, at 15 I could make an Oz. last a whole week...now i dont even get high so I want to tell you that you should try to chill on it so later your able to still get atleast a headchange. deja vu is nothin to think twice about, just enjoy trippin on it while its happening.