ok first of all stop stressing out. i know this is hard to do but it is one of the most counterproductive things you are doing right now. you have got plenty of time before your exam to patch things up providing you use your time efficiently.
i was in the same boat as you. then i literally combed through each aamc i had taken (both right and wrong answers) and for ANYTHING i was remotely unsure of...i wrote down an explanation for (went back to text books etc) until i felt like i knew all there was to know about said topic.
it may be the fact that feeling i knew a lot more than before boosted my confidence, or it could have been that i really did improve knowledge but my scores started shooting up (averaging 3 point increase in all sections).
stay away from whatever aamcs you have left because they are the best gauge of how you will do. take the princetons (they close to mimic aamc) but keep in mind some people find them much harder...so a lower score doesnt mean youre not doing well.
make notes for EVERYTHING you are weak in. review them every day. ummm...........and chill out. its going to be okay.
honestly, i think the authours of the mcat just sit there in glee knowing how much we freak out about the test. if we just learn to control our nerves, we can do so much better and beat them out of their silly mind games.