1) Have done
2, 3 and 4)
Tricky one to answer - is there one thing that has prompted these feelings or something that kickstarted it.
It could be Satan, or it could be something else. Sometimes in a Christian walk, many do feel like God has shut up shop and gone home, and all the answer we get is the silence of God. At times like this, when we lose our intimacy with God, is when Faith kicks in, and we need to just trust on God's promises.
It could be God is using this situation to teach you how to trust him, and how to rely on him even when he is not holding your hand. For instance, I sometimes teach people French. If I was to help them with every word when they are speaking, give them the correct tense, tell them where to put their adjectives, they would produce a perfect sentence in the lesson, but half an hour later they would be no better off. Instead, I have to let them struggle and try and work out the answer themselves, make the odd mistake, because that way they learn. They get frustrated and annoyed sometimes, but in the end, their French is 100 times better for it.
If it is any comfort - you are not the first person to feel this. The writers of the Pslams don't mess about - the commonest cry is "How Long O Lord will you forsake me / leave me to my enemies / let me endure mocking / be far from me". They are full of raw emotion. Yet still God is faithful, and, even when you don't feel Him, He still supplies your life with what you need and blessings unnumbered.
Jesus said to Pilate in John 19:11 "You would have no power over me if it were not given to you from above." Nothing that happens to you is outside of God's will, and Peter tells us that God makes all things work together through Good.
Someone who was going through a hard time wrote once to a friend "Is it not a glorious thing to know, no difference how unjust a thing may be, or how absolutely it may seem to be from Satan, by the time it reaches us it is God's will for us, and will work for good to us. For all things work together for good to us who love God. And even of the betrayal, Christ said 'the Cup which my Father gave to me, shall I not drink it'. We live charmed lives if we are living in the center of God's will. All the attacks that Satan, through other's sin, can hurl against us are not only powerless to harm us, but are turned into blessings on the way"
My friend, I don't know how old you are, but assuming you are quite young as you are still at school. What you are going through is tough and hard work. I know. I've been there. I am there all to often. Hang on in there with God - pray and read your Bible even when it is a chore, even when it seems pointless. God will never leave you alone.
And lastly, a bit of hope. "Through many tribulations we must enter the Kingdom of God" (Acts 14:22) The best things in life come out of wounding. Hang on in there friend!
If you ever want to talk, feel free to PM or add me on MSN.
God Bless you richly
David