these two symptoms are usually associated with a pre-schizophrenia onset. but no panic, i am not a doctor to say that for sure, and there's nothing to worry about if you take control over it: DON'T let anything lead you but your conscious self. stifle away negative thoughts, don't believe what you're hearing. if you experience those comments on your head again, start singing and say out loud and clear, with determination: LALALA, I CAN'T HEAR YOOOOU, I WON'T TALK TO YOU! if it comes again, then: I ALREADY SAID I WON'T LISTEN ANYMOOORE, LALALAAAAA! and how many times it proves necessary for you to get rid of them. unfortunately, most people realise they're hearing "voices" (misguided thoughts) only when they divide themselves in two - at first, it is I, I, I, then you, you, you, then her, her, her (if you're female like me) and sometimes we, we, we. when this happens, it means your subconscious is aware of the problem and somehow splits your personality into distinguished voices.
this might sound actual craziness at first but it REALLY works. i'm saying out of personal experience, i used to have the same problems, and it spun out of control when i smoked marijuana: i'd find myself on another room, holding something, and not knowing how the hell i got there. i mean - it was not a blackout, KNEW i had the idea that guided me there, but i realised it was a broken inserted thought with no visible coherent objective that made me stop my doings and act aimlessly: "why don't you try that coat on your wardrobe?, i bet it would look nice... go, c'mon, what's the big deal? why are you doing that?, stop reading, why don't we go to the kitchen and get..." and another zillion bizarre examples. my first language is Portugues - but that didn't stop an English thought-mode in my head, usualy when i was angry without much noticeable cause, or in blown proportions; so it's pretty normal you hearing a different accent or even another gender on your head. remember always - all the answers are in mind strength, YOU and you only have the whole power to shut the invisible mouths, which even interrupt you on out loud sentences without your acknowledgement, and restablish control over yourself.