Another - 12 (END)

I finished watching Another episode 12. Poooooooooor Kouichi ><" I feel sad for him because he suffered a lot.. Most of the characters in this anime either: kicked, pushed, or harmed him using different weapons. I was surprised that Kazami didn't die at the beginning, but I was scared when he kept killing his classmates (2 of them) >> at that point, I thought that he was the extra (but, he wasn't.. I feel that he deserved his death..). 

Baka Akazawa!!! ><" how can she just go & hit Kazami's head like this!!! (Even thought he actually deserved it :P haha) .. I can understand her anger against Misaki Mei, but she didn't have any rights to attack Kouichi.. Pooor Kouichi! I felt sad for him.. He really was brave..

I really didn't thought at all that Reiko is the extra... It was a shock!! .. It's true that I was confused over: what that bird's usually says "Why Reiko! Poor Reiko!" & what the old man in Kouichi's house said about funerals, but I didn't thought that Reiko is the one.. I thought Kouichi is the extra ^^" .. and I didn’t know that Reiko is Mikami sensei!!!

Well, I was somehow satisfied with the ending, HOWEVER, I am confused over several things, & these things are as the following:

1) Who killed Reiko from 1 year & a half?!! Doesn't he look like Kouichi?!! To me, he looks just like Kouichi >O<"" oh! …

2) Akazawa said that she met Kouichi from 1 year & a half, BUT why can't Kouichi remember?! .. They didn't explain this point ><"""" I am confused !!! 

3) From 1 year & a half, why did Kouichi visit Yomiyama city? & what happened back then?! Did he visit this country because of Reiko’s funeral?! Or something else?!.. 

4) At the beginning of the episodes, why was Kouichi sick? Did something cause him to get sick or ill?!

5) When Akazawa was covered in blood, why did Misaki Mei see a black color (like a shadow) around Akazawa?! >> At that point, I really thought that Akazawa is the extra ><".. Is this black color (shadow) indicated that she is going to die and didn’t mean that she is the extra?!!

6) Oh right! One more thing! Do you remember the old lady who was after Teshigawara & Mochizuki?! After she died, her dead body was lying down, I noticed that there were some marks of being stabbed on her back >>> Who did this thing to her? When & why? & how was she able to run after the kids with her wounds?? ><""" & they didn't explain how her husband die? Why would she kill her husband for example? & Who will even think of killing him?!

*** ahhhhhhhhhhh!! >O<""" Offfffffffff >.<" 

Lots of questions, BUT no answers!!! 

If someone have an answer for any of the above questions, please share it with us ^____^